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# GATE CE 2020 Engineering Mechanics Quiz 3

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Question 1

A lead ball with certain velocity is made to strike a wall, it falls down; but a rubber ball of the same mass and with same velocity strikes the same wall, it rebounds. Select the reason from the following:

Question 2

The coefficient of restitution of a perfectly plastic impact is

Question 3

Two block of mass 5kg and 3kg moving in a speed of 10m/s and 15m/s respectively. After perfectly elastic impact between two bodies the velocity of 5kg block is 12m/s. What will be the final velocity of 3kg block in m/s?

Question 4

Two rigid bodies of mass 5 kg and 4 kg are at rest on a frictionless surface until acted upon by a force of 36 N as shown in the figure. The contact force generated between the two bodies is Question 5

The 2 kg mass C moving horizontally to the right, with a velocity of 5 m/s, strikes the 8 kg mass B at the lower end of the rigid massless rod AB. The rod is suspended from a frictionless hinge at A and is initially at rest. If the coefficient of restitution between mass C and mass B is one, determine the angular velocity of the rod AB immediately after impact. Question 6

A rigid body shown in the Fig.A. has a mass of 10 kg. It rotates with a uniform angular velocity ‘ ’. A balancing mass of 20 kg is attached as shown in Fig. B. . The percentage increase in mass moment of inertia as a result of this addition is  • 400 attempts GradeStack Learning Pvt. Ltd.Windsor IT Park, Tower - A, 2nd Floor, Sector 125, Noida, Uttar Pradesh 201303 help@byjusexamprep.com