If the atmosphere did not contain an ozone layer, which of the following could happen?

the earth would become very cold.
the earth would not have weather.
the earth would not be protected from the sun's harmful rays.
the earth would not be protected from meteorites.

Heat from the sun reaches earth to a. radiation b. convection c. conduction

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u. s. legal proceeding.)

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects