Hydroelectric power is produced by

A. falling water that turns a turbine.

B. tides that pour through a dam barrier.

C. hot water that comes from deep underground.

D. electric current that flows across a dam.

Two campers dock a canoe. One camper has a mass of 100.0 kg and moves forward at 3.0 m/s as he leaves the canoe to step onto the dock. With what speed do the canoe and other camper move if their combined mass is 225.0 kg?

Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, there are about 100 million auto air conditioners that still use CFC-12 (CF2Cl2).

a hot metal bolt of mass 0.05 kg and specific heat capacity 889 joules per kg degree celsius is dropped into a calorimeter containing 0.15 kg water at 21 degrees celsius. the bolt and water resch a final temperature of 25 degrees celsius.

A crane can lift a 900 kg mass to height of 50 m in 2 minutes. Calculate the work done by the crane.

A glass ball weighs 188 g in air, 116 g when immersed in water, and 125 g when immersed in turpentine. Calculate the density of the glass and the density of the turpentine. Density of glass 2.61 g/cm; density of turpentine 0.875 g/cm

The best way to prevent heat exhaustion while exercising is to

The highest frequency radio waves are which type?

When a mass is placed on a spring with a spring constant of 15 newtons per meter, the spring is compressed 0.25 meter. How much elastic potential energy is stored in the spring?

Explain why we see the Milky Way as a faint band of light stretching across the sky.

A piece of plastic tape coated with iron oxide is magnet - ized more in some parts than in others. When the tape is moved past a small coil of wire, what happens in the coil? What is a practical application of this?