Laws of Motion-Equilibrium of Concurrent Forces (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 3 - 4 of 4

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Question number: 3

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2012

MCQ▾

Question

A ball falls vertically downward and bounces off a horizontal floor. The speed of the ball just before reaching the floor (u1) is equal to the speed just after leaving contact with the floor (u2); u1 = u2. The corresponding magnitudes of accelerations are denoted respectively by a1 and a2. The air resistance during motion is proportional to speed and is not negligible. If g is acceleration due to gravity, then:

Choices

Choice (4) Response

a.

a1 = a2 ≠ g

b.

a1 > a2

c.

a1 = a2 = g

d.

a1 < a2

Question number: 4

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

A soldier with a machine gun, falling from an airplane gets detached from his parachute. He is able to resist the downward acceleration if the shoots 60 bullets a second at the speed of 450 m/s. If the weight of a bullet is 53 gm, what is the weight of the man with the gun? Ignore resistance due to air and assume the acceleration due to gravity g = 9.8 ms–2

Choices

Choice (4) Response

a.

112 kg

b.

152 kg

c.

146 kg

d.

136 kg

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