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Question: please help me with these torque questions 1 please explain...

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please help me with these torque questions.

1. please explain why the gears in various exercise machines are not all circular in shape

2. what is an advantage of different shaped cams (gears)?

3. what is an disadvantage of the different shaped cams (gears)?

4. what happens to the amount of torque i can produce at a given joint if i increase the moment arm of my muscles around that joint by a factor of 2x?

5. explain a disadvantage to doubling the moment arm of a muscle around a given joint

since "gear" is in the parenthesis, i assume that #2 and #3 asks about gears??

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