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The radius of planet A is half the radius of planet B. If the mass of A is MA, what must be the mass of B so that the value of g on B is half that of its value on A?

February 4, 2024 by Acche Marks

Ans: 2 MA

An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?

February 4, 2024 by Acche Marks

Ans: 0.4 m/s2

Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, its period of revolution will be 8T.

February 4, 2024 by Acche Marks

Explain why the value of g is zero at the centre of the earth.

February 4, 2024 by Acche Marks

If the value of g suddenly becomes twice its value, it will become two times more difficult to pull a heavy object along the floor. Why?

February 4, 2024 by Acche Marks

A stone thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is same as the time taken to come down.

February 4, 2024 by Acche Marks

Write the three laws given by Kepler. How did they help Newton to arrive at the inverse square law of gravity?

February 4, 2024 by Acche Marks

What are (i) free fall, (ii) acceleration due to gravity (iii) escape velocity (iv) centripetal force ?

February 4, 2024 by Acche Marks

What is the difference between mass and weight of an object. Will the mass and weight of an object on the earth be same as their values on Mars? Why?

February 4, 2024 by Acche Marks

What is shellac?

February 4, 2024 by Acche Marks

Shellac is the refined state of lac acquired through the process of washing and filtration.