NEET UG PHYSICS MCQ: GRAVITATION

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Analyzing +4 | -1

A smooth wedge

\mathrm{A}

is fitted in a chamber hanging from a fixed ceiling near the earth's surface. A block

\mathrm{B}

placed at the top of the wedge takes time

\mathrm{T}

to slide down the length of the wedge and the cable supporting the chamber is broken at the same instant, the block will be

View answer and explanation

Correct option: C

Remain at the top of the wedge

Option C is correct because when the cable breaks, both the wedge and the block become free-falling, resulting in no relative motion between them, and the block remains at the top of the wedge.

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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.