Multiple Choice
A rock rotates around a light, 4-m long string. The rock is initially at rest, but reaches 150 RPM in 3 seconds. Calculate its tangential acceleration after 3 s.
BONUS: Calculate its tangential speed after 3 s.
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Multiple Choice
A disc of radius 10 m rotates around itself with a constant 180 RPM. Calculate the linear speed at a point 7 m from the center of the disc.
A
18.8 m/s
B
21.0 m/s
C
66.0 m/s
D
132 m/s
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