Class XI

A car traveling at 70 Km/ hr east turns south without a change in speed. The car is moving with?
  1. None of these
  2. average velocity
  3. uniform velocity
  4. acceleration
A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be
  1. 4 sec
  2. 10 sec
  3. 8 sec
  4. 1 sec
A particle revolves round a circular path. The acceleration of the particle is
  1. zero
  2. along the circumference of the circle
  3. along the tangent
  4. along the radius
A ball being kicked by a foot and rising at an angle of 30. o from the horizontal. The ball has an initial velocity of 5.0 m/s (Neglect friction). What is the magnitude of the horizontal component of the balls initial velocity
  1. 5.0 m/s
  2. 2.5 m/s
  3. 4.3 m/s
  4. 8.7 m/s
A satellite has mass m speed v and radius r, the force acting on it is:
  1. zero
  2. mv2/r2
  3. mrv2
  4. mv2/r
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