A roller coaster car with a mass of 130 kg travels through a loop with a diameter of 20meters. What is the minimum speed at the top of the loop so that the car stays on the tracks?
m= 130kg
r= 10m
v= ?
m v^2/r = m g so m cancels of course, has to be the same no matter how many in the car :)
v= sqrt (r g)