NEET UG PHYSICS MCQ: GRAVITATION

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Two spaceships are travelling in the same direction. An astronaut in first ship drops a coin and finds that the coin stays at rest. An astronaut in second ship drops a coin and finds that the coin starts moving in forward direction with an acceleration of

2 \mathrm{~m} / \mathrm{s}^2

. Assume that the coin is uncharged and the whole system is in gravity free space:

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Correct option: C

Neither the first ship nor the second can be used as an inertial frame

Option C (Neither the first ship nor the second can be used as an inertial frame) is correct because an inertial frame requires Newton's first law to hold (objects at rest stay at rest), which is violated in the second ship due to the observed acceleration of the coin.

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If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force

\left( { - K/{r^2}} \right)

the total energy is Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.

F \propto \frac{1}{r^3}

, but still remaining a central force. Then Two satellites A and B go round a planet P is circular orbits having radii 16 R and 2 R respectively. If the speed of satellite A is

6\,m{s^{ - 1}}

the speed of the satellite B will be [in m/s] nearly The total energy of satellite moving with an orbital velocity

v

around the earth is Two satellites of same mass are launched in the same orbit of radius

r

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is Statement-1: There is almost no effect of rotation of earth at poles.
Statement-2: Because rotation of earth is about polar axis.