1
NEET 2017
+4
-1
Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will
A
move towards each other.
B
move away from each other.
C
will become stationary.
D
keep floating at the same distance between them.
2
NEET 2016 Phase 2
+4
-1
A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0, the value of acceleration due to gravity at the earth's surface, is
A
$${{m{g_0}{R^2}} \over {2\left( {R + h} \right)}}$$
B
$$- {{m{g_0}{R^2}} \over {2\left( {R + h} \right)}}$$
C
$${{2m{g_0}{R^2}} \over {R + h}}$$
D
$$- {{2m{g_0}{R^2}} \over {R + h}}$$
3
NEET 2016 Phase 2
+4
-1
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
4
NEET 2016 Phase 1
+4
-1
The ratio of escape velocity at earth (ve) to the escape velocity at a planet (vp) whose radius and mean density are twice as that of earth is
A
1 : 4
B
1 : $$\sqrt 2$$
C
1 : 2
D
1 : 2$$\sqrt 2$$
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