For perfectly elastic bodies, the value of coefficient of restitution is

It is appropriate to compensate someone if you have damaged his or her property in some way. This is called Restitution. Which situation below is the best example of Restitution?

A

Jake borrows Leslie's camera and the lens shatters when it falls on the ground because he fails to zipper the case.When Jake returns the camera, he tells Leslie that he will pay for the repair.

B

Rebecca borrows her neighbor's car, and when she returns it, the gas tank is practically empty. She apologizes profusely and tells her neighbor she will be more considerate the next time.

C

Aaron asks Tom to check in on his apartment while he is out of town. When Tom arrives, he discovers that a pipe has burst and there is a considerable amount of water damage. He calls a plumber to repa

D

Lisa suspects that the pothole in her company's parking lot caused her flat tire. She tells her boss that she thinks the company should pay for the repair.

The coefficient of restitution for inelastic bodies is

A

zero

B

between zero and one

C

one

D

more than one

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

A

Tensile strength

B

Elastic limit

C

Proportional limit

D

Yield strength

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

A

Equal to

B

Equal and opposite to

C

Less than

D

Greater than

The phenomenon of collision of two elastic bodies takes place because bodies

A

Immediately after collision come momentarily to rest

B

Tend to compress each other till they are compressed maximum possible

C

Attempt to regain its original shape due to their elasticities

D

All the above

Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

A

Is directly proportional to their velocity of approach

B

Is inversely proportional to their velocity of approach

C

Bears a constant ratio to their velocity of approach

D

Is equal to the sum of their velocities of approach

The total time of collision and restitution of two bodies, is called

A

Time of collision

B

Period of collision

C

Period of impact

D

All the above

A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is

A

0.25

B

0.50

C

0.75

D

1.0

A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is

A

0.25

B

0.33

C

0.40

D

0.50

A material is said to be perfectly elastic if

A

It regains its original shape on removal of the load

B

It regains its original shape partially on removal of the load

C

It does not regain its original shape at all

D

None of these

For perfectly elastic bodies, the value of coefficient of restitution is

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