Labor rates must take into account both the base labor paid to teh mechanic plus the following factors: 1  Mechanics overhead costs - hand tools he usually has to provide. 2  Shop overhead including many consumables, lights, compressors, ramps, lifts, large equipment like alignment and diagnosis tools, cleaning facilities, bathrooms and water.
A wave is a way in which energy travels from one place to another. There are many kinds of waves, such as water waves, sound waves, light waves, radio waves, microwaves and earthquake waves. All waves have some things in common.
In a similar manner, a wave medium is the substance that carries a wave (or disturbance) from one location to another. The wave medium is not the wave and it doesn't make the wave; it merely carries or transports the wave from its source to other locations. In the case of our slinky wave, the medium through that the wave travels is the slinky coils. In the case of a water wave in the ocean, the medium through which the wave travels is the ocean water. In the case of a sound wave moving from the church choir to the pews, the medium through which the sound wave travels is the air in the room. And in the case of the stadium wave, the medium through which the stadium wave travels is the fans that are in the stadium.