### Work, Energy And Power

Work, Energy and Power

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**Work, Energy and Power**knowledge.

A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is ?

A body of mass 10 kg is initially at a height of 20 m above the ground. It falls to a height of 5 m above the ground. Its potential energy in the new position is

A body of mass 100 kg falls from a height of 10 m. Its increase in kinetic energy is

A body of mass 10 kg moving at a height of 2 m, with uniform speed of 2 m/s. Its total energy is

A body of mass 20 kg is initially at a height of 3 m above the ground. It is lifted to a height of 2 m from that position. Its increase in potential energy is

An isolated particle of mass m is moving in a horizontal plane (x-y), along the x-axis, at a certain height above the ground. It suddenly explodes into two fragments of masses m/4 and 3m/4 . An instant later, the smaller fragment is at y = + 15 cm. The larger fragment at this instant is at

When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is

A ball is dropped from a height of 1 m. If the coeffcient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

A ball is dropped from a height of 1 m. If the coffecient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

A marble moving with some velocity collides perfectly elastically head-on with another marble at rest having mass 1.5 times the mass of the colliding marble. The percentage of kinetic energy by the colliding marble after the collision is

A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platform from where the took the jump the total work done by the man at the instant he lands is

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. The electrical energy utilised is

A quantity of work of 1000 J is done in 2 seconds. The power utilised is

Two masses 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is

A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is

(a) 100 J

(b) 392 J

(c) 60 J

(d) -100 J

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platform from where the took the jump the total work done by the man at the instant he lands is

A body of mass 10 kg is moved parallel to the ground, through a distance of 2 m. The work done against gravitational force is

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## Try other Chapter

- Chapter 1: Physical World.
- Chapter 2: Units and Measurement.
- Chapter 3: Motion in a Straight Line.
- Chapter 4: Motion in a Plane.
- Chapter 5: Laws of Motion.
- Chapter 7: System of Particles and Rotational Motion.
- Chapter 8: Gravitation.
- Chapter 9: Mechanical Properties of Solids.
- Chapter 10: Mechanical Properties of Fluid.
- Chapter 11: Thermal Properties of Matter.
- Chapter 12: Thermodynamics.
- Chapter 13: Kinetic Theory of gases.
- Chapter 14: Oscillations.
- Chapter 15: Waves.