Physics equations/06-Uniform Circular Motion and Gravitation/Q:friction


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practice quiz
{A merry-go-round has an angular frequency, $$\omega$$, equal to 0.15 rad/sec. How many minutes does it take to complete 8.5 revolutions? -a) 4.49 minutes. -b) 5.16 minutes. +c) 5.93 minutes. -d) 6.82 minutes. -e) 7.85 minutes.
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{A merry-go round has a period of 0.22 minutes. What is the centripetal force on a 81.2 kg person who is standing 1.64 meters from the center? -a) 26.2 newtons. +b) 30.2 newtons. -c) 34.7 newtons. -d) 39.9 newtons. -e) 45.9 newtons.
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{A merry-go round has a period of 0.22 minutes. What is the minimum coefficient of static friction that would allow a 81.2 kg person to stand1.64 meters from the center, without grabbing something? -a) 0.033 +b) 0.038 -c) 0.044 -d) 0.05 -e) 0.058
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{What is the gravitational acceleration on a plant that is 2.37 times more massive than Earth, and a radius that is 1.52 times greater than Earths? +a) 10.1 m/s2 -b) 11.6 m/s2 -c) 13.3 m/s2 -d) 15.3 m/s2 -e) 17.6 m/s2
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{What is the gravitational acceleration on a plant that is 2.89 times more dense than Earth, and a radius that is 2.38 times greater than Earth's? -a) 58.6 m/s2 +b) 67.4 m/s2 -c) 77.5 m/s2 -d) 89.1 m/s2 -e) 102.5 m/s2
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