A compound
Explanation:
A compound machine is the combination of two or more simple machines.
An example is bicycle.
- A simple machine is a device that is used to increase the magnitude of force.
- It is a basic mechanical unit.
- Examples are inclined planes, lever systems, wheel and axle.
- A compound machine is a combination of these simple machines.
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The answer is a B Light wave can travel in a vacuum and travel at a contest speed even if the light source is moving
Answer: a rubber band
Explanation: A rubber band has no conductivity and no electricity would be able to flow whereas steel and copper and aluminum would be able to allow electricity to flow due to how they are built
