An electromagnet does not attract a piece of iron true or false

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

In the first law of thermodynamics, triangle e=q-w, what does q stand for