Use the values RE = 6370 km = 3960 mi for the radius of the earthSuppose you arc designing...

Use the values RE = 6370 km = 3960 mi for the radius of the earth

Suppose you arc designing a roller-coaster track that will take the cars through a vertical loop of 40-ft radius. If you decide that, for safety, the downward force exerted on a passenger by his or her seat at the top of the loop should be at least one-half the passenger’s weight, what is the minimum safe velocity of the cars at the top of the loop?