Class XI

For earth satellites, the centripetal force is provided by
  1. strong interactions
  2. gravitational force
  3. electrical forces
  4. forces exerted by firing rockets on satellite
The force of attraction due to a hollow spherical shell of uniform density, on a point mass situated inside it, is
  1. positive
  2. none of these
  3. zero
  4. negative
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
A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s−1s−1 . If 20 percent of its initial energy is lost due to Martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it? Mass of mars = 6.4 ×× 10231023 kg; radius of mars = 3395 km; G = 6.67 ×× 10−1110−11 N m2m2 kg−2−2.
  1. 435 km
  2. 495 km
  3. 525 km
  4. 465 km
In Cavendish’s experiment,
  1. torque on bar AB having two small lead spheres due to gravitational forces is balanced by the restoring torque of the wire
  2. net force on bar AB having two small lead spheres due to gravitational forces is negative
  3. net force on bar AB having two small lead spheres due to gravitational forces is positive
  4. net torque on bar AB having two small lead spheres due to gravitational forces is positive
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