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JEE 2020 Physics: Work, Energy and Power 5 (02.08.2019)

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Question 1

A block hangs freely from the end of a spring. A boy then slowly pushes the block upwards so that the spring becomes strain free. The gain in gravitational potential energy of the block during this process is equal to–

Question 2

A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. If K.E. of the block increases by 20 J in 1 s, then–

Question 3

A bus and a car, moving with the same speed are brought to rest by applying the same retarding force then (Given, mass of the bus is more than the mass of the car)

Question 4

A uniform chain of length L and mass M is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is-

Question 5

A force = –k (yi + xj) (where k is a positive constant) acts on a particle moving in the xy-plane .Starting from the origin, the particle is taken along the positive x-axis to the point (a,0), and then parallel to the y - axis to the point (a,a) .The total work done by the force on the particle is–

Question 6

If momentum is increased by 20%, then kinetic energy increased by

Question 7

A 5.0 kg block is thrown up a 30 ° incline with an initial speed v of 6.0 m/s. It is found to travel a distance d = 2.0 m up the plane as its speed gradually decreases to zero. then the loss in mechanical energy of the block due to friction in this process is

Question 8

For the potential energy(U) vs position(x) function shown in fig. there will be an unstable equilibrium at position

Question 9

STATEMENT – 1
Two particles moving in the same direction do not lose all their energy in a completely inelastic collision.
STATEMENT – 2
Principle of conservation of momentum holds true for all kinds of collisions.

Question 10

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy (in J upto two decimal place) loss during the collision is
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Dec 17JEE & BITSAT