A heat engine produces 8200 j of heat while performing 3200 of useful work. what is the efficiency of this engine? (i'm doing something wrong.)

A rabbit is moving in the negative x-direction at 1.10 m/s when it spots a predator and accelerates to a velocity of 13.9 m/s along the negative y-axis, all in 1.20 s. Determine the x-component and the y-component of the rabbit's acceleration.

A vehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road

A 60 kg box is lifted by a rope a distance of 10 meters straight up at constant speed. how much power is required to complete this task in 5 seconds?

A 68 kg skydiver with a parachute falls at constant velocity for 100 m how much work does the earth do on the skydiver

Who put forth the theory of multiple intelligences

Two fire trucks with sirens speeds towards and away from an observer. Which statement is true involving the Doppler effect observed by the observer?

What warm ocean currents keep the NC coast warm, even if it is winter

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What would happen if water could not condense into the atmosphere

How did rutherford's experiment show that thomson's plum pudding model was incorrect?