A heat engine does 9200 J of work per cycle while absorbing 22.0 kcal of heat from a hightemperature reservoir. What is the efficiency of this engine?

Why is everything spinning? Moons, planets and stars all rotate on their axes, moons orbit planets, planets orbit stars, spiral galaxies rotate around super-massive black holes, etc. What force is causing all this spinning?

Which of the following could be used as biomass fuel? Check all that apply. A. Rocks B. Corn stalks C. Plastic D. A tree

Continuous sheet copper is made by electrodeposition from a solution containing CuSO4 onto a rotating drum of lead. For the conditions given below, what should be the rotation speed of the drum (revolution per hour)

The data below are taken from a test of a petrol engine for a motor car. power output 150 kW fuel consumption 20 liters per hour energy content of fuel 40 MJ per litre Which expression will evaluate the efficiency of the engine?

What is the magnitude of the electric field 36.0 cm directly above an isolated 2.71*10-5 C charge? Express your answer to three significant figures and include the appropriate units.

How would you describe the two projectors used to screen a three-dimensional movie? A. Both projectors have vertical polarizers. B. One projector has a vertical polarizer and the other has a horizontal polarizer. C.

A roller coaster has a mass of 500 kg. It drops from rest at the top of a hill that's 57 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2.

Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00m-1, an angular frequency of ω=2.50s-1, and a period of 6.00 s, but one has a phase shift of an angle ϕ=π12rad.

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.