Power is work done over a what?

Explain velocity ratio. Explain and define the efficiency of a machine

A block of wood of mass 300g and density 0.75 g/cm^3 is floating on the surace of a liquid of density 1.1 g/cm^3. What mass of lead (density = 11.3 g/cm^3) must be added to the block in order for the combination just to be submerged?

What happens to the air temperature of a descending mass of air?

Iron filings were sprinkled on a poster board with just one magnet. Describe the results 30 pts

Andrew and maria each collected six rocks, and the masses of the rocks are shown in the table above. the mean of the masses of the rocks maria collected is 0.1 kilogram greater than the mean of the masses of the rocks andrew collected.

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt.

How can you predict the action of the element

How is the mass of a liquid substance affected after it freezes A) It increases. B) It decreases. C) It stays the same.

When a substance goes directly from a solid state to a gas state, as dry ice does, A. the line on the energy-vs.-temperature graph is horizontal. O B. it's called sublimation. I c. it's called deposition. O D. it's called fusion. E.

Three light bulbs are wired in series. What happens if one of these light bulbs burn out