An electric motor must have which of the following in order to work?

galvanometer, power source, secondary coil, or primary coil

What is the magnitude of earth's gravitational force on a 1-kg body at earth's surface?

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?

If an atom loses or gains an electron, it becomes a charged particle or ...

What is the relationship between the speed of light and the index of refraction of a transparent substance?

After bombarding a gold foil sheet with alpha particles, scientists concluded that atoms consist mainly of

A comet has a period of 324 years; in other words, it orbits the Sun in 324 years. Most likely, this comet came from ... (Hint: 324 years define a long period comet) A. Somewhere outside the solar system B. Oort's cloud C. The ecliptic plane D.

4. A pendulum oscillates 12 times in 4 seconds. a. What is the frequency of the pendulum's oscillations? b. What is the period of the pendulum's oscillations?

How many protons and electrons are present in a vanadium atom?

A dog runs 27 m in 3 s. what is the dogs average speed. a 9 m/s b 24 m/s c 30 m/s d 81 m/s

Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m3) of radius 82 km and height 5.0 km