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Motion In Straight Line

Question
CBSEENPH11020315
Wired Faculty App

Two bodies of masses m and 4 m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is

  • -4Gm/r

  • -6Gm/r

  • -9Gm/r

  • zero

Solution

C.

-9Gm/r

GM over straight x squared space equals space fraction numerator straight G left parenthesis 4 straight m right parenthesis over denominator left parenthesis straight r minus straight x squared right parenthesis end fraction 1 over straight x space equals space fraction numerator 2 over denominator straight r minus straight x end fraction straight r minus straight x space equals space 2 straight x 3 straight x space equals space straight r over 3

= -3Gm/r - 6Gm/r = -9Gm/r

Some More Questions From Motion in Straight Line Chapter

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?

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