What is the medium of sound waves from a speaker

When energy changes from one form to another, some energy is always changed to A. sound B. heat C. electricity D. light.

How much wood would a woodchuck chuck if a woodchuck could chuck wood

A maglev train can "float" because magnets in the bottom of the train and on the guideway ... A. have like poles that attract each other B. have unlike poles that repel each other C. have like poles that repel each other

Why can a generator produce electricity?

What kind of thermal radiation does the earth emit?

A Car is lifted a certain distance in a service station and therefore has potential energy relative to the floor. if it was lifted twice as high, how much potential energy would it have?

How long does it take a 750-w coffeepot to bring to a boil 0.75 l of water initially at 11°c? assume that the part of the pot which is heated with the water is made of 280 g of aluminum, and that no water boils away?

An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular deceleration of magnitude 2.23 rad/s 2. Through how many revolutions does the wheel turn before it finally comes to rest

1. What is the atomic number of an atom? Why is this number important? |

The car travels down the road at 60mph for 1.5 hours. How far does it go?