Pick up the correct statement from the following : If two equal and perfectly el

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Question
Pick up the correct statement from the following :
Options
A. If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities.
B. If a sphere impinges directly on an equal sphere which is at rest, then a fraction (1 - e²) the original kinetic energy is lost by the impact.
C. If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres.
D. If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles.
E. All the above.

Correct Answer

All the above.

Applied Mechanics problems

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2. From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of
Options
A. 4.5 cm
B. 5.0 cm
C. 5.25 cm
D. 5.5 cm.

3. The centre of gravity of a homogenous body is the point at which the whole
Options
A. volume of the body is assumed to be concentrated
B. area of the surface of the body is assumed to be concentrated
C. weight of the body is assumed to be concentrated
D. all the above.

5. A particle moving with a simple harmonic motion, attains its maximum velocity when it passes
Options
A. the extreme point of the oscillation
B. through the mean position
C. through a point at half amplitude
D. none of these.

8. Periodic time of body moving with simple harmonic motion, is
Options
A. directly proportional to its angular velocity
B. directly porportional to the square of its angular velocity
C. inversly proportional to the square of its angular velocity
D. inversely proportional to its angular velocity.

9. Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by
Options
A. 5.5 kg
B. 6.25 kg
C. 8.75 kg
D. 10.5 kg.

10. A vehicle weighing w kg is to run on a circular curve of radius r. If the height of its centre of gravity above the road level is h and the distance between the centres of wheels is 2a, the maximum velocity, in order to avoid over turning, will be
Options
A.
B.
C.
D.

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