Time Left - 20:00 mins

JEE 2020 Physics: Work, Energy and Power Quiz 2 (29.07.2019)

Attempt now to get your rank among 166 students!

Question 1

A particle of mass m is moving along the x-axis with speed v when it collides with a particle of mass 2 M initially at rest. After the collision, the first particle has come to rest and the second particle has split into two equal-mass pieces that are shown in the figure. Which of the following statements correctly describes the speeds of the pieces? (θ > 0)

Question 2

Particle ‘A’ moves with speed 10 m/s in a frictionless circular fixed horizontal pipe of radius 5 m and strikes with ‘B’ of double mass that of A. Coefficient of restitution is 1/2 and particle ‘A’ starts its journey at t = 0. The time at which second collision occurs is :

Question 3

The scientists discovered an asteroid having a radius of about 3.5 km and a mass of about 1.2 X 1015 kg. If it is assumed that it is a perfectly uniform sphere what is the escape velocity for an object of mass on the surface of that asteroid?

Question 4

As shown in the figure there is a curved track terminating in smooth horizontal surface. A box of 20 g if released from the height of 5 m on the curved track, what will be the maximum compression in the spring if its spring constant is 400 N/m.

Question 5

A block of mass is sliding down an inclined plane with constant speed. At a certain instant 0, its height above the ground is . The coefficient of kinetic friction between the block and the plane is . If the block reaches the ground at a later instant g, then the energy dissipated by friction in the time interval (g-0) is

Question 6

A particle of mass m, moving with a velocity, collide elastically with another particle of mass 2m which is at the rest initially. Here v0 is constant. Which of the following statement is correct?

Question 7

A force  where k is a positive constant act on a particle moving in x-y plane starting from the point (3, 5), the particle is taken along a straight line to (5, 7). The work done by the force is nk. Find the value of n?

Question 8

A sphere of mass 0.1 kg is attached to a cord of 1m length. Starting from the height of its point of suspension this sphere hits a block of same mass at rest on a frictionless table, If the impact is elastic, then the kinetic energy of the block after the collision is

Question 9

A uniform chain of length L and mass M overhangs a horizontal table with its two-third part on the table. The friction coefficient between the table and the chain is μ. The work done by the friction during the period, the chain slips off the table is

Question 10

A small block of mass m is kept on a rough inclined surface of inclination θ fixed in an elevator. The elevator goes up with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be –
  • 166 attempts
  • 3 upvotes
  • 2 comments

Tags :

Sep 19JEE & BITSAT