Laws of Motion (BITSAT Physics): Questions 5 - 8 of 12

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Question number: 5

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

A 5000kg rocket is set for vertical flaring. The exhaust speed is 800ms . To give an initial upward acceleration of 20ms2, the amount of gas ejected per second to supply the needed thrust will be –

Choices

Choice (4) Response

a.

137.5kgsec

b.

185.5kgsec

c.

187.5kgsec

d.

127.5kgsec

Question number: 6

» Laws of Motion » Force and Inertia

MCQ▾

Question

The earth (mass=6×1024kg) revolves around the sun with an angular velocity 2×107radsec in a circular orbit of radius 1.5×108km . The force exerted by sun on earth in newton is –

Choices

Choice (4) Response

a.

Zero

b.

29×1039

c.

18×1025

d.

36×1021

Question number: 7

» Laws of Motion » Impulse

MCQ▾

Question

If two balls, each of mass 0.06kg , moving in opposite directions with speed of 4ms, collide and rebound with the same speed, then the impulse imparted to each ball due to other is

Choices

Choice (4) Response

a.

0.92kgms

b.

0.81kgms

c.

0.48kgms

d.

0.53kgms

Question number: 8

» Laws of Motion » Impulse

MCQ▾

Question

A force of 50dynes is acted on a body of mass 5gm which is at rest for an interval of 3sec , then impulse is –

Choices

Choice (4) Response

a.

1.5×103Ns

b.

0.16×103Ns

c.

2.5×103Ns

d.

0.98×103Ns

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