1
COMEDK 2024 Morning Shift
+1
-0

If the earth has a mass nine times and radius four times that of planet X, the ratio of the maximum speed required by a rocket to pull out of the gravitational force of planet $$\mathrm{X}$$ to that of the earth is

A
$$\frac{2}{3}$$
B
$$\frac{9}{4}$$
C
$$\frac{3}{2}$$
D
$$\frac{4}{9}$$
2
COMEDK 2023 Morning Shift
+1
-0

Starting from the centre of the earth having radius $$R$$, the variation of $$g$$ (acceleration due to gravity) is shown by

A
B
C
D
3
COMEDK 2023 Morning Shift
+1
-0

If escape velocity on earth surface is $$11.1 \mathrm{~kmh}^{-1}$$, then find the escape velocity on moon surface. If mass of moon is $$\frac{1}{81}$$ times of mass of earth and radius of moon is $$\frac{1}{4}$$ times radius of earth.

A
$$2.46 \mathrm{~kmh}^{-1}$$
B
$$3.46 \mathrm{~kmh}^{-1}$$
C
$$4.4 \mathrm{~kmh}^{-1}$$
D
None of these
4
COMEDK 2023 Morning Shift
+1
-0

The height vertically above the earth's surface at which the acceleration due to gravity becomes $$1 \%$$ of its value at the surface is

A
8R
B
9R
C
10R
D
20R
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