Gravitation - Result Question 23
23. In a rocket a seconds pendulum is mounted. Its period of oscillation decreases when the rocket
[1991]
(a) comes down with uniform acceleration
(b) moves round the earth in a geostationary orbit
(c) moves up with a uniform velocity
(d) moves up with uniform acceleration
Topic 4: Gravitational Field,
Potential and Energy24. The work done to raise a mass $m$ from the surface of the earth to a height $h$, which is equal to the radius of the earth, is :
[2019]
(a) $mgR$
(b) $2 mgR$
(c) $\frac{1}{2} mgR$
(d) $\frac{3}{2} mgR$
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Answer:
Correct Answer: 23. (d)
Solution:
- (d) $T=2 \pi \sqrt{l / g}$. When the rocket accelerates upwards $\mathbf{g}$ increases to $(g+a)$.
