Laws of Motion (KVPY Stream-SA (Class 11) Physics): Questions 9 - 12 of 21

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Question number: 9

» Laws of Motion » Laws of Friction

MCQ▾

Question

A box when dropped from a certain height reaches the ground with a speed V. When it slides from rest from the same height down a rough inclined plane inclined at an angle 60° to the horizontal, it reaches the ground with a speed V2 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 ms-2)

Choices

Choice (4) Response

a.

324

b.

32

c.

334

d.

332

Question number: 10

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2014

MCQ▾

Question

A box when dropped from a certain height reaches the ground with a speed V. When it slides from rest from the same height down a rough inclined plane inclined at an angle 45° to the horizontal, it reaches the ground with a speed V3 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 ms-2)

Choices

Choice (4) Response

a.

89

b.

23

c.

19

d.

13

Question number: 11

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

Question

A stationary U238 nucleus emits on α-particle (2He4) with velocity 1.2×107msec and kinetic energy 3.8 MeV. What is the velocity of the residual nucleus?

Choices

Choice (4) Response

a.

3.02×105msec

b.

2.05×105msec

c.

2.50×105msec

d.

4.15×105msec

Question number: 12

» Laws of Motion » Force and Inertia

Appeared in Year: 2015

MCQ▾

Question

A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms–1 and comes to a halt over a distance of 0.25 m. The average force from the ground on her is close to

Choices

Choice (4) Response

a.

1200 N

b.

1350 N

c.

600 N

d.

1950 N

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