A lumberjack is chopping wood with an ax. How does the ax make the lumberjack's job easier? A. The ax is heavy so it can split wood more easily. B. The ax multiplies the amount of work that is applied by the lumberjack. C. The ax multiplies the amount of force that is applied to the wood. D. The ax reacts with the wood so that it can be split more easily.

B

Explanation:

A machine multiplies the work output of a something by some amount. In this question, the ax is the machine. Thus, the ax is multiplying the work outputted by the lumberjack, so the answer is B. The reason it is not C is because there could be other forces interacting on the wood which the ax can affect.

v=ir = 3x15 =45 v

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