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

practice quiz

1. 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.

2. 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.

3. 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

4. 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

5. 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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