Physics Part-II - NCERT Solutions - GeniusJnr

What are the various energy transformations that occur when you are riding a bicycle?

Explain how animals in Vertebrata are classified into further subgroups.

Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?