What is the unit for efficiency? What is the biggest number the
efficiency can be?
How do you work out the % efficiency?

Which two particles are found in the center of an atom

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?