Two boats pull a 75.0 kg water skier with a 45° from the skier to each boat (90° between altogether). (a) If each boat pulls with a force of 600 N and the skier travels at a constant velocity, what is the magnitude of the resistance force from the water on the skier? (b) Assuming the resistance force remains constant, if the boats now pull with a force of 700 N each what is the magnitude of the acceleration of the skier?

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Astudent is working in the lab to determine how time affect impulse the student keeps the force the same in each row but changes impact the time some data is shown witch trial has the greatest a student is working in the lab to determine how time affect impulse the student keeps the fours the same in each row but change is the impact time some data shown witch trial has the greatest impulse

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good