What causes an atom to be neutral?

a. equal number of protons and neutrons

b. equal distance between the nucleus and electrons

c. equal number of electrons and protons

d. equal distribution of electrons

What type of light is the most dangerous?

The items listed below are found in a science classroom. 1. Heart made of plastic with many of its parts labeled 2. Clay formed to look like Earth and other planets 3. A giant plastic plant cell with removable cell parts 4. Fill in the blank.

An object weighs 10N in air and 70N in water. What is it's weight when immersed in a liquid of relative density 1.5?

The plot of velocity versus time is a horizantal line between, (0, 4), and (5, 4). Time is measures in seconds and velocity in meters per second. What is the position at t=5 s if the position at t=0 was 6 m?

How much work is done by pressure in forcing 9.1 m3 of water through a pipe having an internal diameter of 15 mm if the difference in pressure at the two ends of the pipe is 2.2 atm

The doppler effect is the change in observed frequency due to

Which of the following is NOT a vector quantity? (A) Acceleration (B) Average velocity (C) Linear momentum (D) Potential energy (E) Force

Which of Newton's laws of motion is demonstrated by a hammer pounding a nail into a board

Heated air molecules in a hot air balloon soon carried thermal energy to the top of the balloon. this is an example of ... conduction. Convection. Radiation. Cooling.

When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Which law of motion is being described in this scenario?