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a ball rotating in a circular path of radius 20 cm makes 70 revolutions in 22s find the centripetal acceleration |
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Answer» tion:r = 20/100 m = 0.2md = total DISTANCE covered = 70* CIRCUMFERENCE of circle = 70 * 2πr = 140 * π * 0.2 = 28π metrev = speed = d/t = 28π / 22 = (28* 22)/(22*7) = 4 m/s(π=22/7)So, centripetal acceleration = v²/r = 4²/0.2 = 80 m/s² |
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