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Motion In Straight Line

Question
CBSEENPH11017817
Wired Faculty App

A body weighs 64 N on the surface of the Earth. What is the gravitational force on it due to the earth, at a height equal to half the radius of the earth? 

Solution

Weight of the body = mg = 64 N
So, mass of the body, m = 64 / g = 64/ 10 = 6.4 kg
At height h, the value of g' is given by, 
straight g apostrophe space equals space straight g space straight R squared over open parentheses straight R plus straight h close parentheses squared space equals space 10 open parentheses space fraction numerator straight R over denominator straight R space plus space straight R divided by 2 end fraction close parentheses squared space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 10 space straight x space 4 divided by 9 therefore space Weight space at space straight a space height space straight h space equals space mg apostrophe space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 6.4 space straight x space 10 space straight x space 4 divided by 9 space straight N space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 28.44 space straight N 

Some More Questions From Motion in Straight Line Chapter

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?

A body is thrown with a velocity of 9.8 m/s in the vertical upward direction. What is the velocity after one second?

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