Homework Help: Physics

Posted by Anonymous on Tuesday, November 29, 2011 at 2:25pm.

An early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through one of the slots at the outside edge of the wheel, travels to a distant mirror, and returns to the wheel just in time to pass through the next slot in the wheel. One such slotted wheel has a radius of 8.0 cm and 950 slots at its edge. Measurements taken when the mirror was l = 500 m from the wheel indicated a speed of light of 3.0 105 km/s.

(a) What was the (constant) angular speed of the wheel (in rad/s) ?

(b) What was the linear speed of a point on the edge of the wheel (in m/s) ?

This is my work:

(a)

d=2*L
d=2*500m
d=1000m

t=L/c
t=500m/(3*10^8m/s)
t=0.000002s

angular speed=rw
Where do I go from here?

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