An engine takes in 200 j of heat, expels 40 j of heat, and does 160 j of work. what is the efficiency of the engine? a. 40% b. 60% c. 80% d. 20%

Aball is thrown upward in the air, and its height above the ground after t seconds is h ( t ) = 57 t − 16 t 2 feet. find the time t when the ball will be traveling upward at 14.25 feet per second.

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Choose a synonym for the underlined homonym (a word with two or more meanings). i did not expect the boat to rock so much. a. boulder c. astound b. sway d. shock