NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 829 - 831 of 2320

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Question number: 829

» Laws of Motion » Laws of Friction

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MCQ▾

Question

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. A force F of 2.5 N is applied on the block, as shown. Calculate the force of friction between the block and the floor, (g = 9.8 ms -2)

Choices

Choice (4)Response

a.

2.5 N

b.

zero

c.

25 N

d.

7.84 N

Question number: 830

» Laws of Motion » Laws of Friction

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Question

A block is kept on a horizontal table. The table is undergoing simple harmonic motion of frequency 3 Hz in a horizontal plane. The coefficient of static friction between the block and the table surface is 0.72. Find the maximum amplitude of the table at which the block does not slip on the surface (g = 10 ms -2)

Choices

Choice (4)Response

a.

0.02 m

b.

0.03 m

c.

0.01 m

d.

0.04 m

Question number: 831

» Kinematics » Average Speed and Instantaneous Velocity

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A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass n1 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m 2. (Neglect any loss of material of the bodies, due to action of bullet. ) will be -

Choices

Choice (4)Response

a.

25%

b.

45%

c.

30%

d.

20%

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