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Question
2
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A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?
1. 2 cm 2. 4 cm 3. 6 cm 4. 16 cm
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Question
6
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A car is moving in horizontal circular track of radius 10 m, with a constant speed of 36 km/hour. A simple pendulum is suspended from the roof of the car. If the length of the simple pendulum is 1 m, what is the angle made by the string with the track?
1. 60° 2. 45° 3. 90° 4. 30°
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Question
9
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A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (g = 10 m/s2)
1. 5 m/s 2. 4 m/s 3. 2.5 m/s 4. 7 m/s
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