An ion is a particle, such as an atom, that has become charged because it has different numbers of protons and electrons

True or False

The pump of a water distribution system is powered by a 20-kW electric motor whose efficiency is 90%. The water flow rate through the pump is 40 L/s.

3. By compressing a spring, you increase its length. * True False

A bowling ball with a mass of 7.10 kg has a velocity of 5 m/s. what is the bowling ball's momentum?

Why do astronauts in orbit in space shuttle seem to float

Of the following metals, which is the MOST reactive? A. Li B. Be C. Na D. Mg

Before we can use parallax to measure the distance to a nearby star, we first need to know

In which of the following wave types is the particle motion parallel to wave motion? A longitudinal wave B s wave C surface wave D transverse wave

State the molecular theory of magnetism

A 0.50 kg croquet ball is initially at rest on the grass. When theball is struck by a mallet, the average force exerted on it is240 N. If the ball's speed after beingstruck is 3.0 m/s, how long was the malletin contact with the ball?

What is the speed of a 0.145kg baseball if its kinetic energy is 109J?