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May 5, 2016

# Homework Help: physics

Posted by Joey on Wednesday, January 5, 2011 at 9:35am.

An automobile traveling at 50.0 km/h has tires of 100.0 cm diameter.
(a) What is the angular speed of the tires about their axles?

(b) If the car is brought to a stop uniformly in 25.0 complete turns of the tires (without skidding), what is the magnitude of the angular acceleration of the wheels?

(c) How far does the car move during the braking?
3 m
• physics - Damon, Wednesday, January 5, 2011 at 9:53am

I already took this course. It is your turn to try the problems. When we see exactly what you are having trouble with perhaps we can help.

Remember
Torque = rate of change of angular momentum
= I alpha

omega = w = angular speed
angular momentum = I w

alpha = dw/dt = rate of change of w = angular acceleration

tangential speed = v = w r

distance rolled = r theta = 2 pi r*number of turns

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