The speed of an electric motor canbe controlled by varying the amount of current through the motor

Which of the following statements are true regarding electric generators? Check all that apply. Check all that apply. An electric generator converts mechanical energy into electrical energy.

An inductor connects to an AC circuit. If the frequency of the AC oscillations decreases, does the inductance increase, decrease, or remain constant?

As dry air rises, it expands, and this causes it to cool about 1 degree celsius for every 100 meter rise, up to a height of 12 km.

An auto moves 10 meters in the first second of travel, 15 more meters in the next second, and 20 more meters during the third second. The acceleration of the auto is

To build a neutral atom, there must be an equal number of protons and electrons. Refresh the simulation, and then add six protons and six electrons to make a neutral carbon atom. Click the plus sign on the Mass Number window.

Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planers in orbit around the Sun.

What wave-like property of light causes it to bend when encountering an opening? A. Reflection B. all the above c. Refraction d. none of the above e. diffraction

Which of the following statements describe sliding friction? Select all that apply. 1.) a force that causes an object to increase speed 2.) a force in which one of the objects involved must be a liquid or a gas 3.

What do a broken rode and a volcano eruption have in common

What is the input of energy for a device that provides 50 units of useful energy and has an efficiency of 0.55?