A stone of mass 90g is whirled in a circle along a rope of length 2.8m. If the s

Question

A stone of mass 90g is whirled in a circle along a rope of length 2.8m. If the stone makes 300 revolutions per minute, the centripetal force on the stone is A. 166N B. 222 N C. 249 N D. 263N E. 295N A motorist drives 60 mph for 2 hrs due east then 65mph due north calculate the motorist average velocity for the whole trip A. 53 mph B. 50 mph C. 46 mph D. 48 mph E. 44 mph A stone of mass 90g is whirled in a circle along a rope of length 2.8m. If the stone makes 300 revolutions per minute, the centripetal force on the stone is A. 166N B. 222 N C. 249 N D. 263N E. 295N A motorist drives 60 mph for 2 hrs due east then 65mph due north calculate the motorist average velocity for the whole trip A. 53 mph B. 50 mph C. 46 mph D. 48 mph E. 44 mph A. 166N B. 222 N C. 249 N D. 263N E. 295N A motorist drives 60 mph for 2 hrs due east then 65mph due north calculate the motorist average velocity for the whole trip A. 53 mph B. 50 mph C. 46 mph D. 48 mph E. 44 mph

Explanation / Answer

w = 2pi*N/60 = 2pi*300 / 60 = 31.41 rad/s

centripetal force = mrw^2 = 0.09*2.8*31.41^2 = 248.62 N

so option C) is the correct answer

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