1. A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is

the atomic mass of the atom?

The benguela current, the peru current, and the california current is what

Which statement about plasma is true? A) It contains free electrons. B) It is an electrically neutral gas. C) It contains diatomic gas molecules. D) It can freeze. It is found only in space.

A train travels 600 kilometers in 1 hour. What is the train's velocity in meters/second?

A bullet with mass 0.04000 kg, traveling at a speed of 310.0 m/s, strikes a stationary block of wood having mass 6.960 kg. The bullet embeds into the block. The speed, in m/s, of the bullet-plus-wood combination immediately after the collision is

How to find the density of an irregular object that floats?

Some lactic acid in the muscles dissipates during.

When two waves undergo complete, constructive interference, which of the following increases? A. speed B. amplitude C. wavelength D. frequency

Pressure = Force Area The formula above shows how pressure relates to force and area. For example, the pressure exerted by a fluid is equal to the force of the fluid divided by the area over which the force is applied.

1. Most waves are caused by vibrations. What motion in a transmitting antenna causes the vibrations that produce radio waves? 2. Name two common household appliances that produce electromagnetic waves other than radio waves.

A 3.70 kg block moving 2.09 m/s right hits a 2.42 kg block moving 3.92 m/s left. Find the total momentum of the system.