1
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$$\sqrt 2$$
2
NEET 2016 Phase 1
+4
-1
At what height from the surface of earth the gravitation potential and the value of g are $$-$$5.4 $$\times$$ 107 J kg$$-$$1 and 6.0 m s$$-$$2 respectively? Take the radius of earth as 6400 km.
A
1400 km
B
2000 km
C
2600 km
D
1600 km
3
AIPMT 2015
+4
-1
A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 $$\times$$ 106 m above the surface of earth. If earth's radius is 6.38 $$\times$$ 106 m and g = 9.8 ms$$-$$2, then the orbital speed of the satellite is
A
9.13 km s$$-$$1
B
6.67 km s$$-$$1
C
7.76 km s$$-$$1
D
8.56 km s$$-$$1
4
AIPMT 2015
+4
-1
A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,
A
the linear momentum of S remains constant in magnitude.
B
the acceleration of S is always directed towards the centre of the earth.
C
the angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant.
D
the total mechanical energy of S varies periodically with time.
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