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alexandr1967 [171]
3 years ago
12

chris runs around a circular track with a radius of 39 meters. he makes five trips around the track in 220 seconds. a. what is t

he circumference of the track? b. how many meters does he run? c. what is his angular speed? d. what is his linear speed?
Physics
1 answer:
andriy [413]3 years ago
6 0
Circumference is 2*pi*r = 2*3.14*39 = 244.92 m. 5 trips means 5*244.92 = 1,244.6 m. A radian is 2*pi, therefore, he makes 10pi radians in 220 seconds. Or pi/22 radians/sec is his angular speed. His linear speed is the distance he travelled (1,244.6 m) divided by 220 seconds, which is approximately 5.657 meters per second.
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