NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 179 - 182 of 2142

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Question number: 179

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Mr C. P. Nawani kicked off a football with an initial speed 19.6 m/s at a projection angle 45°. A receiver on the goal line 67.4 m away in the direction of the kick starts running to meet the ball at that instant. What must be his speed so that he could catch the ball before hitting the ground?

Choices

Choice (4) Response

a.

2/V2m/s

b.

39.2 m/s

c.

10 m/s

d.

2.82 m/s

Question number: 180

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The angular velocity of a particle is given by co = 5t - 3t 2 + 1, the time when its angular acceleration decreases to be zero will be -

Choices

Choice (4) Response

a.

0.25 sec

b.

1.2 sec

c.

0.83 sec

d.

25 sec

Question number: 181

» Laws of Motion » Centripetal Force

Assertion-Reason▾

Assertion (Ꭺ)

If net force F acting on a system is changing in direction only, the linear momentum (p) of system changes in direction.

Reason (Ꭱ)

In case of uniform circular motion, magnitude of linear momentum is constant but direction of centripetal force changes at every instant. You have to select the correct choice.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 182

» Kinematics » Uniform Circular Motion

MCQ▾

Question

A particle revolving in a circular path completes first one third of circumference in 2 sec, while next one third in 1 sec. The average angular velocity of particle will be - (in Rad/sec)

Choices

Choice (4) Response

a.

π/3

b.

2π/3

c.

4π/3

d.

5π/3

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