A sleigh weighing 2000 newtons is pulled my a horse a distance of 1.0 kilometer (or 1000 meters) in 45 minutes. what is the power if the horse?

Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. This same unknown tuning fork and a 250 Hz tuning fork are struck. Six beats are heard. Its exact frequency?

a fission reaction possible is that certain atoms are

Andrew is observing the changes of state when an ice cube is slowly heated from - 10C to 110C. a. The molecules escape the liquid state and become a gas. b. The ice cube becomes water vapor. c.

Waves begin to "feel bottom" when the depth of water is

Astronomers analyze starlight to determine a star's (a) temperature; (b) composition; (c) motion; (d) all of the above.

Which part of the motor is responsible for reversing the flow of current?

In a generator, as the magnet spins, opposite poles of the magnet push the electrons in opposite directions. This back-and-forth movement of electrons is called what? A) revolutions per minute B) direct current C) alternating current.

A train travels at a speed of 30 miles/hour and traveled a distance of 240 miles. How long did it take the train to complete its journey?

What is the mass number of a potassium atom that has 20 neutrons

If an atom has a mass number of 23, which of the following is always true? The number of protons in the nucleus does not equal the number of neutrons. The atomic number is less than 11. The atom is not an isotope.