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Homework Help: Problem Help!

  1. Jan 24, 2006 #1
    A bodybuilder is holding a 35-kg steel barbell above her head. How much force would she have to exert if the barbell were lifted underwater?

    In the hydraulic press used in a trash compactor, the radii of the input piston and the output plunger are 6.1 10-3 m and 4.5 10-2, respectively. If the height difference between the input piston and the output plunger can be neglected, what force is applied to the trash when the input force is 300 N?

    Please answer these questions for me, they are the last two problems on my 100 problem worksheet that is due tomorrow. I have literally spent the past two hours trying to find the answers for these and i really need a good grade....Thanks in advance!!!
  2. jcsd
  3. Jan 25, 2006 #2


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    Staff: Mentor

    We don't just give answers here. Tell us how you have started these problems. (hint: do you understand the concepts of buoyancy and levers?)

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