An electric current in a metal consists of moving

(A) Protons

(B) neutrons

(C) electrons

Describe several characteristics that distinguish population I stars from population II stars.

Which one of the following accurately describes the force of gravity

As potential and kinetic energy increase what happens to mechanical energy? A. Mechanical energy increases B. Mechanical energy decreases C. Mechanical energy stays the same D. Mechanical energy has no relation to kinetic and potential energy

What is the relative size and composition of the universe, a galaxy, and a solar system? Is the universe endless?

In the middle of the Indian Ocean, the tsunami referred to in the passage was a train of pulses approximating a sinusoidal wave with speed 200 m/s and wavelength 150 km. What was the approximate period of these pulses? A. 1 min B. 3 min C. 5 min D.

Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg. dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s.

The maximum restoring force that can be applied to the disk without breaking it is 40000 n. what is the maximum oscillation amplitude that won't rupture the disk

Which is a vector quantity speed or velocity

With a naked eye your are unlikely to see a "blank" in your lifetime. A - Comet. B - Shooting Star. C - Meteor. D - Planet.

If there is a current of 15A in a circuit for 5 minutes, what quantity of electric charge flow through the circuit?