A thief weighing 60 kg jumps from the window of a house with a box of 40 kg in his hand. How much weight of the box will he experience?

The reaction $R$ provided by the thief on the box of mass $m$ is, $R=mg-ma$. When the body is falling downwards freely, $g=a$. So, $R=mg-mg=0$. Hence, the thief will not feel any weight of the bag.

Explain why the earth is flattened at the poles.

Two artificial satellites, one close to the surface and the other away are revolving around the earth. Which has larger speed?

We cannot move even a finger without disturbing all the stars. Explain.

How do the K.E. and P.E. of a satellite change when it moves around the earth in elliptical orbit?

At what point of the earth’s surface will a body weigh more?

A body of mass m is hanging from the hook of a spring balance and the balance is also hanging from the ceiling of a freely falling elevator. What will be the reading on balance?

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Explain why the earth is flattened at the poles.

Two artificial satellites, one close to the surface and the other away are revolving around the earth. Which has larger speed?

We cannot move even a finger without disturbing all the stars. Explain.

How do the K.E. and P.E. of a satellite change when it moves around the earth in elliptical orbit?

At what point of the earth’s surface will a body weigh more?

A body of mass m is hanging from the hook of a spring balance and the balance is also hanging from the ceiling of a freely falling elevator. What will be the reading on balance?