In Physics, reading a book and pushing a wall are considered to be work.

In Physics, work is not done when you push a wall.

A person pushing a wall hard is liable to fall back. Give reason.

Figure shown a block P of mass m resting on a smooth horizontal surface, attached to a spring of force constant k which is rigidly fixed on the wall on left side, shown in the figure . At a distance l to the right of the block there is a rigid wall. If block is pushed towards left so that spring is compressed by a distance 5l//3 and when released, if will starts its oscillations. If collision of block with the wall is considered to be perfectly elastic. Find the time period of oscillation of the block.

There are five books on Mathematics and 6 books on Physics in a book shop. In how many ways can a student buy : (i) a Mathematics book and a Physics book (ii) either a Mathematics book or a Physics book?

A man pushes a wall and fails to displace it.He does

Lipika reads a book for 1 frac {3}{4} hours every day. She reads the entire book in 6 days. How many hours in all were required by her to read the book?

Lipika reads a book for 1 3/4 hours every day. She reads the entire book in 6 days. How many hours in all were required by her to read the book?

There are 6 books on mathematics, 4 books on physics annd 5 books on chemistry in a book shop. The number of ways can a student purchase either a book on mathematics or a book on chemistry, is