NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 179 - 182 of 2184

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Question number: 179

» Kinematics » Motion in a Plane

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MCQ▾

Question

The height y and the distance x along the horizontal at plane of the projectile on a certain planet (with no surrounding atmosphere) are given by y = (8t - 5t2) metre and x = 6t metre where t is in second. The velocity with which the projectile is projected is

Choices

Choice (4) Response

a.

6 m/s

b.

Data is insufficient

c.

10 m/s

d.

8 m/s

Question number: 180

» Kinematics » Average Speed and Instantaneous Velocity

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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.

2.82 m/s

b.

2/V2m/s

c.

10 m/s

d.

39.2 m/s

Question number: 181

» Kinematics » Uniformly Accelerated Motion

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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.

25 sec

b.

1.2 sec

c.

0.83 sec

d.

0.25 sec

Question number: 182

» Laws of Motion » Centripetal Force

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Assertion-Reason▾

Question

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 but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is false but Ꭱ is true