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Work and Energy

A light and a heavy object have the same momentum. Find out the ratio of
their kinetic energies. Which one has a larger kinetic energy?

05/11/2024

Science

9th

Work and Energy

If an electric iron of 1200 W is used for 30 minutes everyday, find electric
energy consumed in the month of April.

05/11/2024

Science

9th

Work and Energy

Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force. Explain it with an example.

05/11/2024

Science

9th

Work and Energy

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.

05/11/2024

Science

9th

Work and Energy

The weight of a person on a planet A is about half that on the earth. He can
jump upto 0.4 m height on the surface of the earth. How high he can jump
on the planet A?

05/11/2024

Science

9th

Work and Energy

Can any object have momentum even if its mechanical energy is zero?
Explain

05/11/2024

Science

9th

Work and Energy

Can any object have mechanical energy even if its momentum is zero?
Explain.

05/11/2024

Science

9th

Work and Energy

A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly
tripled, what will be the ratio of two kinetic energies?

05/11/2024

Science

9th

Work and Energy

A body is falling from a height h. After it has fallen a height h/2 , it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy

05/11/2024

Science

9th

Work and Energy

Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

05/11/2024

Science

9th