Biology, 08.07.2019 04:20, tino54

The owner of a building needs to remove several shingles. instead of lifting the shingles up by hand, he decides to use a long crowbar as a lever to lift them. by using this simple machine, the man is the amount of force needed to do the job, and he is the distance over which the force is applied.

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The owner of a building needs to remove several shingles. instead of lifting the shingles up by hand...