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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 the circumference of the track? b. how many meters does he run? c. what is his angular speed? d. what is his linear speed?

Respuesta :

allstarpitcher923
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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