Sound waves cannot travel in

a. steel.

b. air.

c. a vacuum.

d. water. e. sound can travel in all of the above.

How do dolphins communicate with each other

A student measures the speed of a rolling ball three times. She adds the measurements and divides by 3. What quantity did the student calculate?

Calculate the acceleration of the car which moves 36m/s in 8s

Given a resistance of 1500 ohms and a current on 0.03 amps, what's the voltage

What are disadvantages with friction?

J. J Thompson proposed that atoms were made up of positively charged particles with electrons scattered into them. How did he reach this conclusion?

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.