A skating rink with a diameter of d = 0.80 m, moving at a constant speed, moved to a distance of l = 4.0 m in a time interval

univerkov | December 21, 2020 | education

A skating rink with a diameter of d = 0.80 m, moving at a constant speed, moved to a distance of l = 4.0 m in a time interval delta t = 8.0 s. Find the roller speed module.

GIVEN:
l = 4 m
t = 8 s
d = 0.8 m
FIND ω (angular velocity)
DECISION:
ω = V / R
we find the speed V = l / t = 4/8 = 0.5 m / s
then we are looking for the radius of the roller R = 0.8 / 2 = 0.4 m
ω = 0.5 / 0.4 = 1.25
ANSWER: 1.25

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