What is the angular speed of a car wheel of diameter 0.400m when the speed of the car is 108km/h?
A) 75 rad/s B) 150 rad/s C) 270 rad/s D) 540 rad/s Identify equation as w=v/r Diameter = 0.4m Radius = half the diameter = 0.2m Velocity needs to be in m/s so 108km/h = 108000m/h = 30m/s (divide by 60 twice). Angular velocity = v/r = 30/0.2 = 150 therefore B is the answer.
EW
Related Physics A Level answers
All answers ▸Can you explain the Work-Energy principle and how you can apply it in a simple situation such as a box sliding down a rough slope?
A 80kg man is hanging from two 1.5m ropes that lie at 60 degrees from the horizontal. What is the tension in each rope required to prevent the man from dropping?
How can a car be changing velocity yet not changing speed?
Why is the refractive index of water bigger than that of air?