### 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
0
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