A girl throws a rock horizontally from a bridge that is 24 m above the water. It lands in a toy boat that is 18 m away from the base of the bridge where she stands. With what speed was the rock thrown, assuming negligible air resistance?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk, in meters?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Select all the correct answers. which three statements about electromagnetic radiation are true?