Possible Duplicate:
Linear velocity word problems?
How would I solve the following problem?
If a car wheel 78 cm in diameter rotates at 600 r/min what is the speed of the car in km/h?
Possible Duplicate:
Linear velocity word problems?
How would I solve the following problem?
If a car wheel 78 cm in diameter rotates at 600 r/min what is the speed of the car in km/h?
radius of the wheel=$0.39$m. Angular velocity=$600*2\pi/60$ rad/sec.Assuming the case of pure rolling, velocity=$r*\omega$ = $20*0.39.\pi \approx 24.5 m/sec = 88.2 km/hr$.