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what is the arc length of a point that moves with a constant speed of 60 mph along a circle in 15 minutes.

The arc length is _?_ radians

 

 

and 

 

A race car travels around a circular track at a constant speed with a circumference equal to 3 miles. If the car records a time of 10 minutes for 7 laps, what is the linear speed, to the nearest tenth, of the race car in miles per hour?

 Mar 22, 2019
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1) we need to know what the radius of the circle is

 

2) 7 laps is 21 miles, 10 min is 1/6 hr.  (21miles)/(1/6 hr) = 126 miles/hr

 Mar 22, 2019

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