Direct current is produced by

an electric motor

an armature

a solenoid

a battery

Why is the solar cycle said to have a period of 22 years, even though the sunspot cycle is only 11 years long?

What three basic components are atoms made of?

Why did Heisenberg come up with the uncertainty principle? Your answer

Why are there many butt limited combinations of elements that make compounds

Which of the following contains the most thermal energy? a. a cup of hot water b. a cup of cold water c. a hot tub full of hot water d. a large bucket of hot water

A piano tuner hears three beats per second when a tuning fork and a note are sounded together and six beats per second after the string is tightened. What should the tuner do next, tighten or loosen the string? Explain.

How much work is done? A Net Force of 9.0 N acts through a distance of 3.0 m in a time of 3.0 s. The answers are 3.0 J, 9.0 J, 27 J, 81 J.

Two capacitors are identical except that they have different insulators in the gap between the conductors. Capacitor A has an air filled gap while capacitor B uses a material with dielectric constant 3 to keep the conductors apart.

The intensity of the sun's radiation incident upon the earth is about i=1.4kw/m2. suppose this is the value for the intensity of sunlight incident upon the satellite's solar panels. what is the total solar power p absorbed by the panels?

Which possible discovery would be attributed to an inorganic molecule? a protein that contains more energy than lipids a fireproofing spray used in firefighting a new energy-efficient fuel source a synthetic polymer that resists degrading