Question

doubts on gravitation,mechanical properties etc

Answer 1

HI THX FOR CMING ...i hav many doubts so pls stay k?

Answer 2

Sure, I'll try

Answer 3

wow thx

Answer 4

xplain tangential acceleration and radial acceleration .how to find net acceleration?when are the cases when they become 0 alternatively?

Answer 5

turing?

Answer 6

the terms are not quite what I'm used to, but radial acceleration is a result of the change in direction of the object:\[a=\frac{v^2}r\]it is because the motion vector changes that we get this acceleration (change in direction always means acceleration is happening)
so if the object is moving in a straight line the radial acceleration (I call it centripetal acceleration) is zero

Answer 7

this illustrate that the change in direction causes an acceleration because the velocity vector changesAs for tangential acceleration that is a result of the object speeding up or slowing down linearly. if, say, we have an object moving in a circular path we have\[a=\alpha r\]where alpha is the angular acceleration:\[\alpha=\frac{d\omega}{dt}\]So if the angular velocity is changing, the object is experiencing a tangential acceleration.

Answer 8

k

Answer 9

so radiall acc does not contribute to change in angular velocity?

Answer 10

doubt 2:when an apple falls towards earth the earth moves up to meet the apple .is this true xplain?

Answer 11

no radial acceleration happens just by virtue of the object turning, tangential means the object is actually speeding up along the direction of motion (circle, line, whatever)

Last question:
Yes this is true, because the all forces come in action-reaction pairs. Because the earth exerts a force (gravity) on the apple, the apple exerts a gravity force on the earth. The magnitudes of those forces are the same, therefor the earth doesn't move much, but it must theoretically move some.

Answer 12

hey why does earth move less?

Answer 13

because it is more massive, and\[F=ma\]m of the apple is small, and m of the earth is large, so the same force on the apple and earth will cause a much greater acceleration on the smaller mass (the apple) than the earth

Answer 14

k so a body in uniform circular motion has 0 tangential acceleration?

Answer 15

right

Answer 16

do u know applications of modulus of elasticity?

Answer 17

if v1=v2 from one point to the next we have 0 change in tangential velocity, which is tangential acceleration of 0