Class XI

A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the tension in the string?
  1. 6.6 N
  2. 6.1 N
  3. 6.9 N
  4. 6.3 N
A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200 N?
  1. 35 m s−1
  2. 37 m s−1s−1 H
  3. 33 m s−1
  4. 33 m s
A man of mass 70 kg stands on a weighing scale in a lift which is moving upwards with a uniform speed of 10 m s−1s−1, what would be the reading on the scale?
  1. 75 kg
  2. 35 kg
  3. 70 kg
  4. 105 kg
A man of mass 70 kg stands on a weighing scale in a lift which is freely falling under gravity. What would be the reading on the scale?
  1. 125 kg
  2. 0 kg
  3. 95 kg Hz
  4. 115 kg
A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform acceleration of 5 m s−2s−2 what would be the reading on the scale?
  1. 45 Kg
  2. 35 kg
  3. 53 kg
  4. 35 kg
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