When Joe saw the Rocky Mountains for the first time, he exclaimed, "These mountains are much younger than ours back East!" Explain which feature supports his conclusion that the Rockies were relatively young mountains.

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

Which lists the organs in the correct order as food passes from the mouth to anus?