Ultraviolet rays from the sun are able to reach earth's surface because-a: they require air to travel throughb: they have less energy than infrared raysc: they have lower frequency than visible lightd: they can travel through empty space

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

Abanked road comer of radius 146 m is to be constructed. if the comer is designed for vehicles moving with a speed of 20.0 m/s, what should the banking angle be, in units of degrees?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.