Which is true of a mechanical wave?

A) It must have a medium.

B) It must travel in empty space.

C) Both sound and light are examples.

D) It can travel in a vacuum.

What it means to say that energy is consevered as a ball fall towards the ground

Which of the following is a list of greenhouse gases? a. oxygen, nitrogen, carbon dioxide b. water vapor, oxygen, sulfur c. water vapor, nitrogen, helium d. water vapor, carbon dioxide, methane D?

True or False: If the Stirling engine increases the entropy of the universe when the cycle is run clockwise, it will decrease the entropy of the universe when it is run counterclockwise as a heat pump.

An electric fan spinning with an angular speed of 13 rad/s has a kinetic energy of 4.6 j. what is the moment of inertia of the fan?

In order to boil an egg, a student puts the egg in a pan of water and heats the pan on the stove. Which methods of the heat transfer are used to transfer the majority of the heat to the water and the egg?

At what temperature did the substance in the test tube into a solid?

What occurs when the velocity of Earth is doubled? a. The orbit of Earth around the Sun becomes smaller b. The orbit of Earth does not change c. The Earth escapes the Sun d. The orbit becomes more elliptical

When is a body said to be at rest

27. Calculate the impulse when an average force of 10 N acts on a cart for 5.0 s.

A boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him