A motor must lift a 70 pound object to a height of 14 feet about the floor. What is the minimum amount of work the motor must do?

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

Answerok the answer is (all)