Suppose you put in 100 j of work on a lever and get out 93 j of work. what is the efficiency of the lever and how much of the work input is lost as heat in joules?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical