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 is the photo-electric effect and what impact did it have on the development of Quantum Mechanics?
What is the maximum speed of an electron emitted from a metal surface with a threshold frequency of 5.706*10^(14) by light with a wavelength of 350nm?
A ball is thrown downwards from a height of 10m with speed of 5m/s, assuming g=10m/s^2, calculate the final velocity of the ball when it hits the ground
Describe one technique you could use to measure the threshold voltage for LEDs.