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Motion In Straight Line

Question
CBSEENPH11017765
Wired Faculty App

What is the value of orbital velocity when satellite just revolves around the earth?

Solution
When the satellite is very close to the earth, then r ~ R.
∴ the orbital velocity,

     straight v subscript straight o equals square root of GM over straight R end root equals square root of gR  
        equals space square root of 9.81 cross times 6.4 cross times 10 to the power of 6 end root space straight m divided by straight s 
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        space space equals 7.923 km divided by straight s

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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