physics problems(6)

2006-11-24 8:27 pm
the combine mass of a race car and its driver is 600kg. traveling at constant speed, the car car completes one lap around a circular track of radius 160m in 36s

a) find the speed of the car
b) find the centripetal acceleration of the car

explain in details

回答 (1)

2006-11-25 1:05 am
✔ 最佳答案
(a) Distance travelled in a complete lap = 2xpix160 m = 1005 m
where pi=3.14159...

Speed = distance/time = 1005/36 m/s = 27.9 m/s

(b) Centripetal acceleration = v^2/r
where v is the speed and r is the radius of circle
thus centripetal acceleration = 27.9^2/160 m/s2 = 4.87 m/s2


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