Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

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,
A:
P + m.a = 0
B:
P - m.a = 0
C:
P x m.a = 0
D:
P/m.a = 0
Answer: B
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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:
A:
both the balls undergo an equal change in momentum
B:
the change in momentum suffered by rubber ball is more than the lead ball
C:
the change in momentum suffered by rubber ball is less than the lead ball
D:
none of the above
Answer: B
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The total motion possessed by a body, is called
A:
impulsive force
B:
mass
C:
weight
D:
momentum
Answer: D
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In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
A:
50
B:
100
C:
150
D:
200
Answer: B
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The frequency of oscillation of a compound pendulum is(where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)
A:
B:
C:
D:
Answer: C
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