choose the correct answer 0.2 kg stone is attached to a string and swung in acir

Question

choose the correct answer 0.2 kg stone is attached to a string and swung in acircle of radius 0.6 m on a horizontal and frictionless surface. Ifthe stone makes 150 revolutions per mintue, the force of the stringon the stone is a) 0.03 N b) 0.2 N c) 0.9 N D) 1.96 N E) 30 N choose the correct answer 0.2 kg stone is attached to a string and swung in acircle of radius 0.6 m on a horizontal and frictionless surface. Ifthe stone makes 150 revolutions per mintue, the force of the stringon the stone is a) 0.03 N b) 0.2 N c) 0.9 N D) 1.96 N E) 30 N

Explanation / Answer

Given : .                 Mass (m) = 0.2 kg   ; radius(r) = 0.6 m ; .                  = 150 rpm = 150 * (2 /60) radians / s   = 15.7 radians /s . We know that : .                Force is :   F   = m r2    = 0.2 * 0.6 *(15.7)2   = 29.5788 ˜ 30 N . Hope this helps u!

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