JEE PHYSICS MCQ: GRAVITATION

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Application +4 | -1

Two small bodies of masses

10 \mathrm{~kg}

and

20 \mathrm{~kg}

are kept a distance

1.0 \mathrm{~m}

apart and released. Assuming that only mutual gravitational forces are acting, find the speeds of the particles when the separation decreases to

0.5 \mathrm{~m}

View answer and explanation

Correct option: D

4.2 \times 10^{-5} \mathrm{~m/s};\,\,2.1 \times 10^{-5}\mathrm{~m/s}

Option A (B) is correct because the magnetic field at the center of a solenoid depends on the number of turns per unit length, which remains the same when the solenoid is cut in half.

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. If the body is projected in a direction making an angle of

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with the vertical, the escape velocity will be The escape velocity of a body projected from the surface of earth is

v_e

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