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Motion In Straight Line

Question
CBSEENPH11017513
Wired Faculty App

If acceleration due to gravity at the surface of the earth is g, what will be the acceleration due to gravity at height h? 

Solution
At surface of the earth, the acceleration due to gravity g is given by, 
                          straight g equals GM over straight R squared 
                   
At height h from surface of the earth, it is given by
space space space space space space space straight g subscript straight h equals fraction numerator GM over denominator left parenthesis straight R plus straight h right parenthesis squared end fraction equals GM over straight R squared fraction numerator straight R squared over denominator left parenthesis straight R plus straight h right parenthesis squared end fraction 
      space space space equals straight g fraction numerator straight R squared over denominator left parenthesis straight R plus straight h right parenthesis squared end fraction 
    straight g subscript straight h equals straight g fraction numerator straight R squared over denominator straight R squared open parentheses 1 plus begin display style straight h over straight R end style close parentheses squared end fraction equals straight g open parentheses 1 plus straight h over straight R close parentheses to the power of negative 2 end exponent  
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Some More Questions From Motion in Straight Line Chapter

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

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.

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