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If done long enough, rubbing two sticks together can produce enough heat to start a fire.  If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is:

A 30 kg box is lifted from the ground to a height of 1.5 m.  The work done is:

Which of the following substances would likely have the least laminar flow?   

Unloading valves are commonly installed in hydraulic clamping and bending systems because their cylinders extend and retract their rods, one after another.

Most professional certifications for fluid power technicians are valid for up to ___ year(s), at which time they must be renewed.

Coalescing fi lters should be installed as far as possible from the point of work.

___ valves can be used in hydraulic systems that require a rod to quickly extend to the point of work and then slowly extend once it is at the point of work.

Pseudocavitation occurs when the outlet port of a pump is restricted.

Air-cooled heat exchangers work best when the ambient temperature is lower than ___°F.

Electricity is the energy released by the fl ow of electrons in a conductor.