Class XI

A ‘central’ force is always directed
  1. at a fixed angle to the position vector of the point of application of the force with respect to the fixed point
  2. at a varying angle to the position vector of the point of application of the force with respect to the fixed point
  3. along the position vector of the point of application of the force with respect to the fixed point
  4. perpendicular to the position vector of the point of application of the force with respect to the fixed point
Titania, the largest moon of the planet Uranus, has 1818 the radius of the earth and 1170011700 the mass of the earth. What is the acceleration due to gravity at the surface of Titania? Data: G = 6.67××10−1110−11 N m22/kg22, RE = 6.38 ×× 106106 m, mEmE = 5.97 ×× 10241024 kg
  1. 0.43 m/s22 Hz
  2. 0.18 m/s2
  3. 0.37 m/s 2
  4. 0.28 m/s2
Weight of an object on the surface of the moon is
  1. 1/5 th that on the surface of the earth
  2. 1/3 that on the surface of the earth
  3. ½ that on the surface of the earth
  4. 1/6 that on the surface of the earth
The mass of an object __________
  1. varies at different locations
  2. remains constant
  3. be measured using spring balance
  4. ) is in the direction of gravitational force.
For a satellite to be in a circular orbit 780 km above the surface of the earth, what orbital speed must it be given?
  1. 7360 m/s
  2. 7260 m/s
  3. 7460 m/s
  4. 7160 m/s
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