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Mechanical Engineering - Engineering Mechanics

Exercise : Engineering Mechanics - Section 5
11.
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
both the balls undergo an equal change in momentum
the change in momentum suffered by rubber ball is more than the lead ball
the change in momentum suffered by rubber ball is less than the lead ball
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion,
P + m.a = 0
P - m.a = 0
P x m.a = 0
P/m.a = 0
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.
Yes
No
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The friction experienced by a body, when at rest, is known as
static friction
dynamic friction
limiting friction
coefficient of friction
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
The moment of inertia of a solid sphere of mass m and radius r is
2mr2/3
2mr2/5
mr2
mr2/2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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