A neutral atom of aluminum has 14 neutrons and 13 protons. How many electrons does this aluminum have?

1

13

14

27

A 4.25-g bullet traveling horizontally with a velocity of magnitude 375 m/s is fired into a wooden block with mass 1.12 kg, initially at rest on a level frictionless surface.

Give a specific example of a machine and describe how its mechanical efficiency might be calculated

If a body with a mass of 4 kg is moved by a force of 20 N, what is the rate of its acceleration?

What rms current flows in a 48 mH inductor when 111 V rms at a frequency of 23 KHz is applied to it?

3. A train has broken through the wall of a train station. During the collision, what can be said about the force exerted by the train on the wall? a.

Hannah has information about an object in circular orbit around Earth. mEarth = 6.0 * 1024 kg G = 6.67 * 10-11 What additional information does Hannah need in order to calculate the tangential speed of the orbiting object?

All objects are attracted to each other by the force of

Samantha wants to study circus performance when she gets to college. She has mastered many physical skills already, but she keeps falling short on her jumps.

Is this Conduction, Convection, or Radiation: The top floor of a building is the warmest.

The law that states the volume of gas is directly proportional to its temperature in kelvins if the pressure and the number of particles is constant is * a. Boyle's Law b. Gay-Lussac's Law c. Einstein's law. d. Charles's law.