HARD
11th West Bengal Board
IMPORTANT
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Find the relation between conservative force and potential energy.

Important Questions on Work, Energy and Power

MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 22
A body of mass m tied to the string revolves in a vertical circle of radius r. Find the tensions in a string when it makes angle 0°, 45°, 135° and 180° with the downward vertical. Find the minimum velocity the body must have at its lowest point in order to be able to complete the full circular motion.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 23
A body of mass m tied to a string of length 1 is hanging vertically. Find the range of horizontal velocity it may acquire for which it will execute a pendulum-like oscillation.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 23
A body of mass m kg tied to a string of length 1 m is hanging vertically. Find the range of horizontal velocity it may acquire for which it will rise along a vertical circle up to a certain height and then follow a parabolic path.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 1
How much work is done in raising a mass of 1 kg to height of 10 metre? The kinetic energy of a body is 1 joule; a force of 1 mega-dyne is applied against its motion. How much distance will the body go before it comes to rest?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 2
A certain force performed 112 J of work in raising a mass of a 4 kg vertically through 1 m from the ground. With what acceleration had the body moved up?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 3
A pump can lift 100 litres of water per minute to a height of 10 m. What is the power required. Take acceleration due to gravity=10 ms-2.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 4
A pump can raise 200 kg of water from a well to an average height of 120 m per 5 minute. If the efficiency of the pump is 70%, find its power.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 5
A boy pulls a 0.5 kg block along a horizontal surface at a constant speed through a distance of 10 m. What work does he do on block if the co-effn of kinetic friction between the block and the surface is 0.2 and his pull makes an angle of 45° with the horizontal?