Class XI

The value of the gravitational constant G is
  1. G = 6.67××10−1110−11 m22/kg2
  2. G = 6.67××10−1110−11 N m22/kg
  3. G = 6.67××10−1110−11N m22/kg2
  4. G = 6.67××10−1110−11 N m/kg2
If a film of width L is stretched in the longitudinal direction a distance d by force F, surface tension is given by
  1. S = F/3L
  2. S = F/2L
  3. S = F/L
  4. S = F/4L
The direction of the universal gravitational force between particles of masses m1m1 and m2m2 is:
  1. towards m1
  2. towards m2m2 on m1m1 and towards m1m1 on m2m2.
  3. towards m2
  4. towards the center of the earth
The acceleration due to gravity at the North Pole of Neptune is approximately 10.7 ×× m/s2m/s2. Neptune has mass 1.0 ×× 10261026 kg and radius 2.5 ×× 104104 km and rotates once around its axis in about 16 h. What is the apparent weight a 5.0-kg object at Neptune’s equator?
  1. 50 N
  2. 49 N
  3. 52 N
  4. 51 N
Determine the kinetic energy a 5 000-kg spacecraft must have in order to escape the Earth’s gravitational field. Mass of the earth = 6.0 ×× 10241024 kg; radius of the earth = 6.4 ×× 106106 m; G = 6.67 ×× 10−1110−11 N m2 kg−2
  1. 3.04 ×× 10111011J
  2. 3.14 ×× 10111011J
  3. 3.34 ×× 10111011J
  4. 3.53 ×× 10111011J
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