What is the law that states momentum cannot be created or destroyed?

It's part of a crossword puzzle so it should contain the following letters ...

o-2nd letter

s-4th letter

a-8th letter

m-10th letter

Which of the following is NOT true of exercise machines? A. Most exercise machines are expensive to purchase individually. B. Most exercise machines require spotters for safe operation. C.

When an electron jumps from high-to low-energy levels: A. Radio and gamma rays are produced. B. A wave of visible light is produced. C. A wave with parallel electric and magnetic fields results. D. Waves of differing speeds may be produced.

Which may result from an increase in friction? Check all that apply. A) increased traction B) increased speed C) decreased speed D) generated heat E) reduced wear and tear

In a parallel circuit is the current constant throughout the circuit or does it vary?

An electromagnetic wave traveling through space encounters an electron sitting at rest. Upon being hit by the wave, which way will the electron move? A. It will bob up and down with the crests and troughs B.

A baseball player is dashing toward home plate with a speed of 3.8 m/s when she decides to hit the dirt. She slides for 1.3 s, just reaching the plate as she stops (safe, of course).

The water that powers the generators enters and leaves the system at a low speed (thus we can neglect its change of kinetic energy) and loses 160 m of altitude during the process.

What is: the fastest car the fastest animal the fastest human the fastest aeroplane

Why is gravitational potential energy negative?

Imagine an elevator crowded with too many passengers for such a small space. This situation would be a good analogy for a substance with what property