Thứ Hai, 30 tháng 1, 2017

Youtube daily Jan 30 2017

CINDY: THIS IS A GENTLE SLAP

FROM MOTHER NATURE.

IT'S NUTS.

TAKE A LOOK AT THE CALENDAR.

15 DAYS IN A ROW ABOVE AVERAGE.

THINGS ARE CHANGING A LITTLE

BIT.

HERE WE GO THIS WEEK.

THE JET STREAM TO OUR SOUTH.

THAT IS GOING TO BRING IN COLDER

AIR TO NEW ENGLAND.

TEMPERATURES WILL TREND NEAR OR

BELOW AVERAGE AT TIMES THE NEXT

COUPLE OF DAYS.

AVERAGE HIGH IS 36.

NO 40'S OR 50'S THIS WEEK.

WE'RE GOING TO KEEP TEMPERATURES

IN THE 30'S.

FEELING MORE SEASONAL IN THE

DAYS AHEAD.

COLD START OUT THE DOOR.

TEENS SHOWING UP NORTH AND WEST

OF TOWN.

BEDFORD 19.

17 ORANGE.

14 JAFFREY.

WORCESTER 24 DEGREES RIGHT NOW.

WE HAVE PARTLY CLOUDY SKIES.

YOU CAN SEE HOW THE CLOUDS

INCREASE THIS AFTERNOON.

YOUR TEMPERATURES MAY HOVER NEAR

OR BELOW THE FREEZING MARK

THROUGH WORCESTER COUNTY.

30 IN BOSTON, UPPER 20'S IN THE

CAPE.

TEMPERATURES WILL TOP OUT IN THE

MID 30'S FROM BOSTON DOWN

THROUGH THE SOUTH SHORE AND CAPE

AND LOWER 30'S BACK TO THE

WORCESTER HILLS.

INCREASING CLOUDS.

NOT A LOT HAPPENING NOW.

WHEN YOU LOOK TO THE SOUTH,

THERE'S A LITTLE BIT OF SNOW IN

THE D.C. AREA.

THIS IS GOING TO TRACK JUST

SOUTH OF OUR REGION.

MOST OF US AREN'T GOING TO SEE

MORE THAN CLOUD COVER.

THIS MAY GRAZE NANTUCKET WITH

LIGHT RAIN AND SNOW AS WE GET

DEEPER IN THE AFTERNOON.

THE BRIGHTER SKIES WILL BE PAST

LUNCHTIME.

CLOUDS WILL INCREASE A LITTLE

BIT.

ON THE CAPE, VINEYARD AND

NANTUCKET, COULD BE A PERIOD OF

LIGHT RAIN OR SNOW.

BY ABOUT 5:00, 6:00 THIS

AFTERNOON INTO THIS EVENING, IT

PULLS AWAY QUICKLY OVERNIGHT,

AND SKIES CLEAR OUT.

THAT WILL ALLOW TEMPERATURES TO

DROP WAY DOWN.

THIS TIME TOMORROW, HEADING OUT

THE DOOR, MANY OF US IN THE

TEENS.

THE WINDS WON'T BE STRONG.

WE'LL HAVE COLD AIR IN PLACE

TOMORROW MORNING, BUT IT'S A

QUIET START ON TUESDAY.

ANOTHER SYSTEM IS GOING TO RACE

TOWARD US.

THIS ONE IS STARVED FOR

MOISTURE.

DURING THE AFTERNOON AND EVENING

HOURS, IT WILL BE COLD ENOUGH

FOR LIGHT SNOW TO BREAK OUT.

AS THIS SITS IN THE WATERS, IT'S

GOING TO PULL IN EXTRA MOISTURE.

THAT MAY KEEP SNOW SHOWERS GOING

INTO WEDNESDAY MORNING AS WELL.

A LIGHT SNOW EVENT COMING LATER

TUESDAY INTO WEDNESDAY MORNING,

COATING TO AN INCH SOUTH OF

BOSTON, ONE TO TWO BOSTON TO

WORCESTER, AND SOUTHERN NEW

HAMPSHIRE, THE ROUTE 2 CORRIDOR,

COULD SEE LOCALIZED TWO TO THREE

INCHES OF SNOW.

HERE'S THE TIMELINE.

THE MORNING HOURS ARE QUIET.

AS WE GET TOWARD THE AFTERNOON,

5:00, 6:00, DURING AND AFTER THE

EVENING COMMUTE, LIGHT SNOW

CONTINUES INTO THE OVERNIGHT.

WE WILL WAKE UP TO IT WEDNESDAY.

WE'LL DRY THINGS OUT IN THE

AFTERNOON.

For more infomation >> Video: Cold, seasonal day ahead - Duration: 2:41.

-------------------------------------------

یہ بارش اللە رب العزت کی رحمت یا عزاب - Duration: 0:57.

For more infomation >> یہ بارش اللە رب العزت کی رحمت یا عزاب - Duration: 0:57.

-------------------------------------------

بال کاٹنے کا انوکھا طریقہ - Duration: 1:48.

For more infomation >> بال کاٹنے کا انوکھا طریقہ - Duration: 1:48.

-------------------------------------------

Wake Up Call from Stanley School - Duration: 0:35.

>> FROM THE FAMILY SCHOOL IN

WALTHAM, MASSACHUSETTS,

CELEBRATING INCLUSIVE SCHOOLS

WEEK.

GOOD MORNING, EYEOPENER.

YAY!

RANDY: GOOD MORNING.

THANK YOU VERY MUCH.

THANKS FOR THE GREAT WAKE-UP

CALL.

EMILY: IT'S SO EASY FOR YOUR

CLASS TO APPEAR ON THE

EYEOPENER.

For more infomation >> Wake Up Call from Stanley School - Duration: 0:35.

-------------------------------------------

Laptop HP 15 - dane techniczne - RTV EURO AGD - Duration: 0:46.

For more infomation >> Laptop HP 15 - dane techniczne - RTV EURO AGD - Duration: 0:46.

-------------------------------------------

Chicken Soup Cook-Off raises money for needy - Duration: 0:55.

WE WILL HAVE ANOTHER GO AT SOME

SNOW DURING THE WEEKEND.

ANDREW: HUNDREDS OF GALLONS OF

SOUP WILL MAKE A DIFFERENCE FOR

OUR COMMUNITY.

EVERYONE FROM AMATEUR COOKS TO

PROFESSIONAL RESTAURANTS ENTERED

THIS YEAR'S CHICKEN SOUP

COOK-OFF.

THE DONATION AT THE DOOR MEANT

ALL YOU CAN EAT SOUP.

WICH ON SYCAMORE CLAIMED THE

CROWD FAVORITE PRIZE.

>> THERE'S ALL KINDS OF REALLY

GOOD CHEFS HERE.

WE HAVE A GREAT

MASTER-APPRENTICE RIVALRY.

WE HAVE A COUPLE BRAVOS.

WE HAVE CHEFS THAT LEFT ONE

RESTAURANT AND WENT TO ANOTHER,

WHO ARE HERE COMPETING AGAINST

THEIR FORMER RESTAURANT.

ALL THIS GREAT FUN, ALL ABOUT

FOOD AND FELLOWSHIP, AND TO HELP

A WORTHY CAUSE

ANDREW: THE COOK-OFF ALSO

FEATURED LIVE MUSIC A MAGIC SHOW

-- LIVE MUSIC, A MAGIC SHOW, AND

A PROGRAM FOR KIDS.

PARKER'S BLUE ASH TAVERN HOSTED

THE EVENT.

IT BENEFITS THE WISE TEMPLE

For more infomation >> Chicken Soup Cook-Off raises money for needy - Duration: 0:55.

-------------------------------------------

Erica Fox's willpower tested by starburst on co-worker's desk - Duration: 0:53.

TAYLORSVILLE ROAD,

NO PROBLEMS TO REPORT, SO ALL

LAST WEEK ON RICK VAN HOOSE'S

DESK, HE HAD A RED STAR BURST.

>> IT YOU EAT IT?

>> I POSTED IT AND O SOCIAL

MEDIA, SHOULD I TAKE IT, IS IT A

TEST OF MY WIL POWER

I COME IN, THERE'S A NOTE ON MY

DESK THAT SAYS, AIR CAGE YOU

PASSED THE TEST MUCH ENJOY.

>> WHAT COLOR DO YOU LIKE?

>> PINK.

>> I'LL TAKE WHATEVER YOU DON'T.

IT'S ALL CANDY AND IT'S ALL

GOOD.

>> THAT'S SO SWEET.

I WAS REWARDED FOR NOT STEALING

AND I REALLY WANTED TO TAKE IT.

>> IT WAS THE RED ONE THAT WAS

SITTING ON THERE.

>> ALL WEEK IT WAS SITTING

THERE.

For more infomation >> Erica Fox's willpower tested by starburst on co-worker's desk - Duration: 0:53.

-------------------------------------------

Lift elbow and knee on all four -gentle twist of spine- (Feldenkrais ATM) - Duration: 14:00.

For more infomation >> Lift elbow and knee on all four -gentle twist of spine- (Feldenkrais ATM) - Duration: 14:00.

-------------------------------------------

دکھ پردیساں دےخوبصورت انداز میں گانا - Duration: 1:49.

For more infomation >> دکھ پردیساں دےخوبصورت انداز میں گانا - Duration: 1:49.

-------------------------------------------

19. Physics | MOD | Graphical Analysis of Motion | by Ashish Arora (GA) - Duration: 17:11.

Dear students, now we are going to use graphical analysis of motion. as we are studying rectilinear

motion, in rectilinear motion 3 types of graph are used in motion analysis. we'll see that

these graphs are quite helpful, in solving various kind of problems of , rectilinear

motion also. these three types of graph are . displacement versus time graph. second is,

velocity versus time graph . and the third is, acceleration versus time graph. we also

discuss the variant of displacement time graph as, distance time graph . we'll also discuss

distance versus time graph. we'll also discuss speed versus time graph, because , some particular

type of problems are also asked on distance and speed versus time graphs. but we don't

need to spend much time on these at, slight variations of displacement and velocity time

curves. lets discuss these one by one. now if we talk about displacement versus time

graphs . these are also known as , position versus time graphs. there is no difference

between position versus time and displacement versus time graphs. say for a given rectilinear

motion, we, draw the displacement time curve, like this. so this is the curve, according

to which, the position of a particle varies with time. so its function is given as x=

f of t. in this situation at any instant of time, (t) we can directly get the position

of particle by using, this curve, or by substituting the value of time in this function. say if

this point is p, we draw a tangent , of this curve at this point p, and say it makes an

angle theta with the time axis so we can simply state. the slope of the curve. at point p

can be written as, d x by d t, which is = tan theta . and we all know that d x by d t, can

be directly written as, instantaneous velocity of the particle at this position p. so by,

displacement time graph , at any point if we want to calculate , or we want to evaluate

the instantaneous velocity of the particle, we just need to find out the slope of the

curve, at that point and the slope will be directly give us the, instantaneous velocity

of the particle at that point. so in this situation we can see that, this tangent makes

an acute angle, with the, time axis, here we can simply state the velocity v p which

is tan theta , will be a positive , quantity. if we talk about the decreasing part of the

curve at a point q, if we consider a tangent, you can state, this angle theta dash will

be an obtuse angle. so at point q, the instantaneous velocity can be written as tan theta dash.

and tangent of the obtuse angle can be written as, a negative physical quantity. so in the

decreasing part of curve we can say with time the displacement is coming down , or displacement

is decreasing. or, as if we talk about the position of particle it is moving towards

origin. so we can state vector ally the velocity will be, negative. we can also talk about

various situations, like, for a practical situation . if say, a particle moves, in such

a way, that, first it accelerates, than it moves uniformly, and then say it retards . initially

say it was at rest, and finally also say it'll come to rest . so first it accelerates its

velocity increases, than it moves uniformly , and then finally, it comes to rest. now

in such situations, if particle is accelerating we can simply state the slope will first increase.

and then it moves uniformly that mean its slope remains constant, because you can see

the slope is giving as the instantaneous velocity. and if it it retards, that mean the slope

decreases and finally it becomes zero. so if we draw, the displacement time graph, of

such a motion, we can state first slope is increasing, the curve goes like this you can

see , continual sly the angle which , tangent makes with the time axis increasing. and then

say, for a time t 1 it is, accelerating, and from time t 1 to t 2 or you can say for a

duration t 2 , it moves uniformly so we can draw a straight line. so here, the whole slope,

for the duration t 2 remains constant, then it retards , so you can simply draw a curve

like this. which for another duration say t 3. now in this situation finally you can

see the slope become zero and earlier also slope was zero. this is the curve , which

is representing a motion where particle first accelerate, then moves uniformly and then,

retards . similar to this if we just, consider an experimental

situation like, say this positive direction of x axis. from origin a particle starts.

it moves with a velocity v. it goes up to a particular position in a time t 1. then

for a time t 2 it remains at rest over there , and then it comes back to origin, with the

same velocity v. in a time t 3. so from zero to t 1, it was moving uniformly , up to, this

position, say we write maximum displacement x m. for a duration t 2 it remains at rest,

and then , for at time t 2 it'll start, moving in opposite direction, and time t 3 it comes

back. now if we draw, the , position versus time graph, for this motion. you can simply

state it t = 0 particle starts, with an uniform velocity, uniform velocity means the slope

remains constant here we can write tan theta = v. this was the time t 1 for which the particle

was moving uniformly. then you can state up to time t 2 , or for the duration t 2 minus

t 1 it remains at rest. so its position remains constant i.e. at, x m. and then, it'll start

coming back so the velocity, is in opposite direction or we can say, when it was moving

toward (right) velocity was positive and now velocity is negative. so it comes down and

at a time t 3 it'll reach the, original position back. so, you can simple state again x becomes

zero. and say this angle is theta dash, so we can again write tan theta dash is equals

to v. now this angle will be , 180 minus theta, and we can state the, tangent of obtuse angle

is negative . so this angle theta dash can be directly taken as the angle by which we

can directly calculate the negative slope . so this is the, curve which is drawn , for

uniform motion then rest for some duration , and then again uniform motion in opposite

direction . now if similar , this is the curve which we call as position time curve or position

time graph . if similar graph is drawn for distance time .

let us draw distance time graph for the same, motion of particle when it is moving then

rest , taking rest and then coming back. so you can simply state , if we talk about displacement

, it first increases to x m then decreases to zero. but when we talk about distance , we

can state distance is continually increasing, because from here to here the distance is

x m, and when it comes back , the total distance travelled by the particle will become 2 x

m. now only difference in position time and distance time graph, can be taken, that, distance

time graph , if this is taken as distance, distance time graph will never come down.

say it'll first increase to a position, of x m, for a time t 1, than, it remains, at

rest , up to a time t 2, and then again it returns back, but if we talk about, position

it is coming down, but if we talk about distance it is still increasing, so the same graph

can be, drawn in reverse direction. so up to a time t 3, it will be able to cover a

distance of 2 x m. this is the distance time graph for the same motion, you can simply

state if we are having a displacement time graph, then for those portions of displacement

time graph, where the curves is coming down, you can draw the mirror image with respect

to time axis in upward direction, that will become, distance time graph.

if we talk about velocity time graphs. these are the graphs relating velocity with time.

say we draw, graph in, velocity and time, for motion of particle, this graph is drawn,

for the function of velocity how it varies with time. at, any position of this graph,

similar to, that of displacement time graph. here if you draw tangent , and you find out

the slope, of this graph, say at point x, we can simply state this point is relating

time with, velocity. and here the slope can be written as d v by d t or it can be written

as tan theta. and here the slope is giving us, the acceleration of particle at the position

x. so always remember that the slope of velocity time graph gives us the , instantaneous acceleration.

and, if a slope is positive like, here you can see acceleration at point x, it is

tan theta and theta is acute angle this can be taken as , positive acceleration . positive

acceleration means the velocity, and acceleration have same direction and you can simply state,

the, speed of particle is increasing or the magnitude of velocity is increasing in this

case. when we talk about the decreasing part of the curve , at any position if we draw

tangent, you can see the angle theta dash is obtuse. so this the point y, so we can

say acceleration at point y it'll be tan theta dash , which is an negative quantity. so here

you can see the velocity is decreasing so acceleration we considered to be negative.

so be careful about, the situation, where we have finding the slope of velocity time

curve as, acceleration. along with this we are already studied, in calculus, that area

under a curve can be given by, for between, two, coordinates on time axis, say t 1 and

t 2. if we find out the area of this curve. so area under the curve can be given as,

integration of v d-t from t 1 to t 2 . here you can see, this integration of v d-t, will

be given as displacement only. because, if we talk about v into d-t, it is the displacement

covered by the particle during the time d-t. so if we calculate the total displacement

of particle, from point t 1 to time t 2, it can directly be given as, integration of v

d-t from t 1 to t 2, it'll give us the displacement of particle. from t =, t 1 to, t 2. this

is another advantage of using velocity time graph, that from velocity time graph using

slope we can find out the instantaneous acceleration of particle, and finding out the area under

the curve, like say if we find out this area by using integration, this area under the

curve gives us the, displacement of particle, between two given time instants, in the

given situation.

if we just have a look on motion situation, as shown in the velocity time graph. a particle

moves in such a way that, t= 0 its initial velocity was zero, first velocity increases

that means it was accelerating, and then after some time it'll decreases and again

it become zero at time t 1. than velocity becomes negative, you can say, this is the

negative direction of velocity, and velocity becomes negative that means particle as returned

in opposite direction, and at time t 2 (again) its velocity become zero. so in such situation

you can say from time 0 to t 1. the area between the curve and the time axis, above the time

axis this, positive. and from time t 1 to t 2 you can see, that this area is below the

time axis, so this is written as negative. say, this total area is s1 and this total

area is s 2. so we can state, total displacement. of particle. from t = 0 to t 2. is, total

displacement can be written as s 1 minus s 2. but when we talk about distance travelled.

you can always write distance travelled= s 1 + s 2. because s 1 is the distance travelled,

in positive direction and s 2 is the distance travelled in, opposite direction. so displacement

will be s 1 minus s 2, but when we talk about distance travelled it will be s 1 + s 2, so

be careful about such situations, while drawing velocity time curves. similar to this we can

also talk about, acceleration time graphs. but there is nothing much to discuss about

acceleration time graphs. like if we draw acceleration time graph, for a given motion,

you can simply state in acceleration time graph if we find out the slope. that a slope

will give us the (rate) with which will the acceleration is varying. which is not of much

import ants, in, our limitations, or, in the syllabus we are analyzing the things, but

when we talk about the, (area) under the acceleration time curve or area between the acceleration

time curve and time axis, say between to instants t 1 and t 2, so when it is of, quite importance

like, if we find out this area. this area is say (a) so this (a) can be written as integration

of (a) d-t from time t 1 to t 2. this (a) d-t will give us, net change. in velocity,

of particle. from, t 1 to t 2. there is something which is important for us to keep in mind,

integration of (a) d-t from t1 to t 2 gives us the net change in velocity of particle

in going from, time t 1 to, time t 2. this, you should always keep in mind

For more infomation >> 19. Physics | MOD | Graphical Analysis of Motion | by Ashish Arora (GA) - Duration: 17:11.

-------------------------------------------

19. Physics | MOD | Graphical Analysis of Motion | by Ashish Arora - Duration: 17:11.

Dear students, now we are going to use graphical analysis of motion. as we are studying rectilinear

motion, in rectilinear motion 3 types of graph are used in motion analysis. we'll see that

these graphs are quite helpful, in solving various kind of problems of, rectilinear

motion also. these three types of graph are. displacement versus time graph. second is,

velocity versus time graph. and the third is, acceleration versus time graph. we also

discuss the variant of displacement time graph as, distance time graph. we'll also discuss

distance versus time graph. we'll also discuss speed versus time graph, because, some particular

type of problems are also asked on distance and speed versus time graphs. but we don't

need to spend much time on these at, slight variations of displacement and velocity time

curves. lets discuss these one by one. now if we talk about displacement versus time

graphs. these are also known as, position versus time graphs. there is no difference

between position versus time and displacement versus time graphs. say for a given rectilinear

motion, we, draw the displacement time curve, like this. so this is the curve, according

to which, the position of a particle varies with time. so its function is given as x=f

of t. in this situation at any instant of time, (t) we can directly get the position

of particle by using, this curve, or by substituting the value of time in this function. say if

this point is p, we draw a tangent , of this curve at this point p, and say it makes an

angle theta with the time axis so we can simply state. the slope of the curve. at point p

can be written as, d x by d t, which is = tan theta. and we all know that d x by d t, can

be directly written as, instantaneous velocity of the particle at this position p. so by,

displacement time graph, at any point if we want to calculate, or we want to evaluate

the instantaneous velocity of the particle, we just need to find out the slope of the

curve, at that point and the slope will be directly give us the, instantaneous velocity

of the particle at that point. so in this situation we can see that, this tangent makes

an acute angle, with the, time axis, here we can simply state the velocity v p which

is tan theta, will be a positive, quantity. if we talk about the decreasing part of the

curve at a point q, if we consider a tangent, you can state, this angle theta dash will

be an obtuse angle. so at point q, the instantaneous velocity can be written as tan theta dash.

and tangent of the obtuse angle can be written as, a negative physical quantity. so in the

decreasing part of curve we can say with time the displacement is coming down, or displacement

is decreasing. or, as if we talk about the position of particle it is moving towards

origin. so we can state vector ally the velocity will be, negative. we can also talk about

various situations, like, for a practical situation. if say, a particle moves, in such

a way, that, first it accelerates, than it moves uniformly, and then say it retards. initially

say it was at rest, and finally also say it'll come to rest. so first it accelerates its

velocity increases, than it moves uniformly, and then finally, it comes to rest. now

in such situations, if particle is accelerating we can simply state the slope will first increase.

and then it moves uniformly that mean its slope remains constant, because you can see

the slope is giving as the instantaneous velocity. and if it it retards, that mean the slope

decreases and finally it becomes zero. so if we draw, the displacement time graph, of

such a motion, we can state first slope is increasing, the curve goes like this you can

see, continual sly the angle which, tangent makes with the time axis increasing. and then

say, for a time t 1 it is, accelerating, and from time t 1 to t 2 or you can say for a

duration t 2, it moves uniformly so we can draw a straight line. so here, the whole slope,

for the duration t 2 remains constant, then it retards, so you can simply draw a curve

like this. which for another duration say t 3. now in this situation finally you can

see the slope become zero and earlier also slope was zero. this is the curve, which

is representing a motion where particle first accelerate, then moves uniformly and then,

retards. similar to this if we just, consider an experimental

situation like, say this positive direction of x axis. from origin a particle starts.

it moves with a velocity v. it goes up to a particular position in a time t 1. then

for a time t 2 it remains at rest over there, and then it comes back to origin, with the

same velocity v. in a time t 3. so from zero to t 1, it was moving uniformly, up to, this

position, say we write maximum displacement x m. for a duration t 2 it remains at rest,

and then, for at time t 2 it'll start, moving in opposite direction, and time t 3 it comes

back. now if we draw, the, position versus time graph, for this motion. you can simply

state it t = 0 particle starts, with an uniform velocity, uniform velocity means the slope

remains constant here we can write tan theta = v. this was the time t 1 for which the particle

was moving uniformly. then you can state up to time t 2, or for the duration t 2 minus

t 1 it remains at rest. so its position remains constant i.e. at, x m. and then, it'll start

coming back so the velocity, is in opposite direction or we can say, when it was moving

toward (right) velocity was positive and now velocity is negative. so it comes down and

at a time t 3 it'll reach the, original position back. so, you can simple state again x becomes

zero. and say this angle is theta dash, so we can again write tan theta dash is equals

to v. now this angle will be, 180 minus theta, and we can state the, tangent of obtuse angle

is negative. so this angle theta dash can be directly taken as the angle by which we

can directly calculate the negative slope. so this is the, curve which is drawn, for

uniform motion then rest for some duration, and then again uniform motion in opposite

direction. now if similar, this is the curve which we call as position time curve or position

time graph. if similar graph is drawn for distance time.

let us draw distance time graph for the same, motion of particle when it is moving then

rest, taking rest and then coming back. so you can simply state, if we talk about displacement,

it first increases to x m then decreases to zero. but when we talk about distance, we

can state distance is continually increasing, because from here to here the distance is

x m, and when it comes back, the total distance travelled by the particle will become 2 x

m. now only difference in position time and distance time graph, can be taken, that, distance

time graph, if this is taken as distance, distance time graph will never come down.

say it'll first increase to a position, of x m, for a time t 1, than, it remains, at

rest, up to a time t 2, and then again it returns back, but if we talk about, position

it is coming down, but if we talk about distance it is still increasing, so the same graph

can be, drawn in reverse direction. so up to a time t 3, it will be able to cover a

distance of 2 x m. this is the distance time graph for the same motion, you can simply

state if we are having a displacement time graph, then for those portions of displacement

time graph, where the curves is coming down, you can draw the mirror image with respect

to time axis in upward direction, that will become, distance time graph.

if we talk about velocity time graphs. these are the graphs relating velocity with time.

say we draw, graph in, velocity and time, for motion of particle, this graph is drawn,

for the function of velocity how it varies with time. at, any position of this graph,

similar to, that of displacement time graph. here if you draw tangent, and you find out

the slope , of this graph, say at point x, we can simply state this point is relating

time with, velocity . and here the slope can be written as d v by d t or it can be written

as tan theta. and here the slope is giving us, the acceleration of particle at the position

x. so always remember that the slope of velocity time graph gives us the, instantaneous acceleration

and, if a slope is positive like, here you can see acceleration at point x, it is

tan theta and theta is acute angle this can be taken as, positive acceleration. positive

acceleration means the velocity, and acceleration have same direction and you can simply state,

the, speed of particle is increasing or the magnitude of velocity is increasing in this

case. when we talk about the decreasing part of the curve, at any position if we draw

tangent, you can see the angle theta dash is obtuse. so this the point y, so we can

say acceleration at point y it'll be tan theta dash, which is an negative quantity. so here

you can see the velocity is decreasing so acceleration we considered to be negative.

so be careful about, the situation, where we have finding the slope of velocity time

curve as, acceleration. along with this we are already studied, in calculus, that area

under a curve can be given by, for between, two, coordinates on time axis, say t 1 and

t 2. if we find out the area of this curve. so area under the curve can be given as,

integration of v d-t from t 1 to t 2 . here you can see, this integration of v d-t, will

be given as displacement only. because, if we talk about v into d-t, it is the displacement

covered by the particle during the time d-t. so if we calculate the total displacement

of particle, from point t 1 to time t 2, it can directly be given as, integration of v

d-t from t 1 to t 2, it'll give us the displacement of particle. from t =, t 1 to, t 2. this

is another advantage of using velocity time graph, that from velocity time graph using

slope we can find out the instantaneous acceleration of particle, and finding out the area under

the curve, like say if we find out this area by using integration, this area under the

curve gives us the, displacement of particle, between two given time instants, in the

given situation.

if we just have a look on motion situation, as shown in the velocity time graph. a particle

moves in such a way that, t= 0 its initial velocity was zero, first velocity increases

that means it was accelerating, and then after some time it'll decreases and again

it become zero at time t 1. than velocity becomes negative, you can say, this is the

negative direction of velocity, and velocity becomes negative that means particle as returned

in opposite direction, and at time t 2 (again) its velocity become zero. so in such situation

you can say from time 0 to t 1. the area between the curve and the time axis, above the time

axis this, positive. and from time t 1 to t 2 you can see, that this area is below the

time axis, so this is written as negative. say, this total area is s1 and this total

area is s 2. so we can state, total displacement. of particle. from t = 0 to t 2. is, total

displacement can be written as s 1 minus s 2. but when we talk about distance travelled.

you can always write distance travelled= s 1 + s 2. because s 1 is the distance travelled,

in positive direction and s 2 is the distance travelled in, opposite direction. so displacement

will be s 1 minus s 2, but when we talk about distance travelled it will be s 1 + s 2, so

be careful about such situations , while drawing velocity time curves. similar to this we can

also talk about, acceleration time graphs. but there is nothing much to discuss about

acceleration time graphs. like if we draw acceleration time graph, for a given motion,

you can simply state in acceleration time graph if we find out the slope. that a slope

will give us the (rate) with which will the acceleration is varying. which is not of much

import ants, in, our limitations, or, in the syllabus we are analyzing the things, but

when we talk about the, (area) under the acceleration time curve or area between the acceleration

time curve and time axis, say between to instants t 1 and t 2, so when it is of, quite importance

like, if we find out this area. this area is say (a) so this (a) can be written as integration

of (a) d-t from time t 1 to t 2. this (a) d-t will give us, net change. in velocity,

of particle. from, t 1 to t 2. there is something which is important for us to keep in mind,

integration of (a) d-t from t1 to t 2 gives us the net change in velocity of particle

in going from, time t 1 to, time t 2. this, you should always keep in mind

For more infomation >> 19. Physics | MOD | Graphical Analysis of Motion | by Ashish Arora - Duration: 17:11.

-------------------------------------------

A UFC Fighter ATTACKS Arnold Schwarzenegger - Duration: 2:51.

A Governor, movie star and former professional bodybuilder Arnold Schwarzenegger was attacked

by A man claiming to be a UFC fighter for promoting Steroids.

The unidentified man reached near the actors car and started questioning him about the

use and promotion of Steroids in the past to which Arnold did not react.

Security was seen stopping the man and dragging him away from his his $2.25 million Bugatti

Veyron convertible.

The 69 year old actor maintained silence and preffered to not comment on it as he drove

calmly smoking a cigar.

It was long time back that the star claimed that he had no regrets using steroids as he

was just experimenting with it but does not encourage anyone to use drugs.

Let us know through your comments below for more news on hollywood subscribe to our channel

For more infomation >> A UFC Fighter ATTACKS Arnold Schwarzenegger - Duration: 2:51.

-------------------------------------------

Gonzalez to challenge GOP Gov. Charlie Baker - Duration: 1:08.

IS REPORTEDLY A

FINALIST.

EMILY?

EMILY: THANK YOU.

NEW THIS MORNING --

THE FIGHT FOR THE STATE HOUSE IS

ON.

GOVERNOR BAKER FACING HIS FIRST

CHALLENGE.

AND THE EYEOPENER'S SERA CONGI

IS LIVE IN WITH DETAILS IN

OVERNIGHT.

SERA?

SERA: EMILY, INDICATIONS ARE

THAT GOVERNOR BAKER WILL SEEK

ANOTHER TERM IN 2018, BUT THIS

MORNING HE IS GETTING HIS FIRST

OFFICIAL CHALLENGER.

DEMOCRAT JAY GONZALEZ IS

LAUNCHING HIS BID TODAY.

GONZALEZ IS 46 YEARS OLD, LIVES

IN NEEDHAM.

HE WAS THE ADMINISTRATION AND

FINANCE SECRETARY UNDER GOVERNOR

DEVAL PATRICK.

HE OVERSAW THE BUDGET.

HE WILL ASSOCIATE BAKER WITH

PRESIDENT DONALD TRUMP WHO LOST

MASSACHUSETTS IN THE

PRESIDENTIAL ELECTION.

GONZALEZ WON'T BE THE ONLY

CHALLENGER.

NEWTON MAYOR SETTI WARREN IS

EXPECTED TO LAUNCH A RUN FOR

GOVERNOR IN THE COMING MONTHS.

THE DEMOCRAT TALKED ABOUT IT

JUST THIS WEEK ON NEWSCENTER 5'S

"O.T.R."

OTHERS COULD BE IN ON THE MIX.

FORMER STATE SENATOR DAN WOLF AS

WELL AS ATTORNEY GENERAL MAURA

For more infomation >> Gonzalez to challenge GOP Gov. Charlie Baker - Duration: 1:08.

-------------------------------------------

Der Rezeptkasten ersetzt die Apotheke | Zur Sache Baden-Württemberg - Duration: 4:54.

For more infomation >> Der Rezeptkasten ersetzt die Apotheke | Zur Sache Baden-Württemberg - Duration: 4:54.

-------------------------------------------

Мульт Неновости выпуск 12 Топ 3 ютуб, топ 10 Вконтакте, ваши рисунки. - Duration: 11:17.

For more infomation >> Мульт Неновости выпуск 12 Топ 3 ютуб, топ 10 Вконтакте, ваши рисунки. - Duration: 11:17.

-------------------------------------------

Drink This Water Glass 3 Days In The Magic Happens Immediate - Duration: 5:39.

Drink This Water Glass 3 Days In The Magic Happens Immediate

For more infomation >> Drink This Water Glass 3 Days In The Magic Happens Immediate - Duration: 5:39.

-------------------------------------------

The Magic Happens When You Eat Corn Maize Every morning 1 Continuous Linked In 1 Week - Duration: 5:00.

The Magic Happens When You Eat Corn Maize Every morning 1 Continuous Linked In 1 Week

For more infomation >> The Magic Happens When You Eat Corn Maize Every morning 1 Continuous Linked In 1 Week - Duration: 5:00.

-------------------------------------------

Singam - 3 Mass Collection Report | சிங்கம் 3யின் வசூல் வேட்டை - Duration: 2:34.

Singam - 3 Mass Collection Report | சிங்கம் 3யின் வசூல் வேட்டை

S3 Will Join 200 Crore Club ? | Surya, Anushka | Singam 3

Singam 3 Boxoffice Collection Will Cross 200 Crore | Shocking News | Suriya Si 3 news

Surya Singam 3 Collection Cross 200 Crore, Suriya Si3 Movie Latest News

Suriya's Box Office Records | BlockBuster ,Hits ,Flop , Exclusive Report

Singam 3 trailer box office hit

s3,surya,s3 official trailer,s3 official teaser,s3 songs,anushka,sruthy hassan,tamil cinema updates,ymix tamil

S3 Official Teaser , Tamil , Suriya, Anushka Shetty, Shruti Haasan ,Harris Jayaraj , Hari

Singam 3 First Scenes Are Coming soon | Official Announcement

Exclusive Interview with Surya - Singam 3 Team | Pongal Special | Kalaignar TV

Không có nhận xét nào:

Đăng nhận xét