Astudent drove to the university from her home and noted that the odometer on her car increased by 13.0 km. the trip took 17.0 min. (a) what was her average speed? (b) if the straight-line distance from her home to the university is 10.3 km in a direction 25.0â° south of east, what was her average velocity? (c) if she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?

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?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?