A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually uses 1549 N of input force. The roofer decides that it would be easier to use a system of pulleys to raise the shingles. Using the pulleys, 446 N are required to lift the shingles. What is the mechanical advantage of the system of pulleys?
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A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually uses 1549 N...
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