Tag: general knowledge

Running a ceiling fan in an enclosed room during the summer will slowly raise the room’s temperature (assuming no heat transfer in or out).

When a person uses a simple machine, such as a lever or a pulley, the work or energy output from the simple machine can never be higher than the work or energy input by the person using the simple machine (neglect any potential energy that may have been previously stored in the machine).

If there were no energy losses due to friction or unwanted heat transfer, an internal combustion engine could be built for an automobile which would be capable of converting 100% of the combustion energy in gasoline into energy used for moving the car. (Assume 100% of the fuel is burned during combustion.)

Energy is the ability to do work. In other words, if Ben needed 1000 joules of energy to move a box 5 meters across the floor it would make no difference whether he had 1000 joules of thermal energy or the same amount of mechanical energy. He could still do the work required to get the job done