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 ▸What's the moment of a force and why would I need to understand it?
How does circular motion work?
Using Fermat's Principle explain why it makes sense for light be refracted when crossing from one medium into another that has a different refractive index.
What is the difference between potential energy and potential?