What can't sound travel through?

A device that makes work easier by changing the size or direction of a force is called what?

What happens when two forces act in the same direction?

A river current is 8.0 m/s downstream, and a boat is traveling 10.0 m/s upstream. Use equations to describe the boats instananeous velocity relative to the riverbank

Two guitars are playing together producing a beat frequency. The first guitar is playing at a frequency of 867 Hz and the beat is produced every 0.04 seconds.

The term relative intensity is used to denote the amount of energy expended per minute. a. True b. False

A bathroom scale is compressed 0.21 in. when a 210 -lb person stands on it. Assuming that the scale behaves like a spring that obeys Hooke's law, how much does someone who compresses the scale 0.06 in.

Explain what happens when a ferromagnetic material is made into a permanent magnet.

You are drawing a branching diagram to show the relationship between Turtles frogs and alligators which two organisms does the diagram indicateas having the most recent common ancestor

Estimate the length of the neptunian year using the fact that the earth is 1.50Ã108km from the sun on average.

Identify one type of electromagnetic energy that has a shorter wave length than green light