Created by StemPy LabA small ball moves at straight towards a very heavy wall, which is itself moving towards the ball at . The collision is perfectly elastic. The speed of the ball after it bounces off is
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← A small bead can slide without friction on a circular wire ring of radius 20 cm. The ring stands in a vertical plane and spins about its vertical diameter at 10 rad/s, as shown in the figure. Taking g = 10 m/s², at what angle from the lowest point of the ring (measured at the centre) can the bead stay at rest relative to the ring, apart from the bottom itself?A uniform disc of mass 4 kg and radius 0.5 m can turn freely about a fixed horizontal axle through its centre. A light string wound round it is pulled with a steady force of 10 N, starting from rest. After 2 s, the angular velocity of the disc and the length of string pulled off are →
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