A man of $50 kg$ jumps to height of $3 m$ . What is the maximum potential energy that he will have? (Take $g = 10 m / s^{2}$ )

Important Questions on Work and Energy

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 13

Find the energy in

kWh

consumed in

10 h

by a machine of power

500 w

.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 14

How many joules of energy are consumed by a

1000 W

heater used for

2 h

?

HARD

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 15

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 16

What do you mean by gravitational potential energy? Show that gravitational potential energy is independent of the path followed.

HARD

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 17

How does energy varies in a an oscillating pendulum? Express how many times potential energy and kinetic energy attain maximum in an oscillation?

MEDIUM

9th CBSE