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    mikaelaq23's Avatar
    mikaelaq23 Posts: 13, Reputation: 1
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    #1

    Dec 3, 2009, 04:27 AM
    ask me help desk
    During a workout, a person repeatedly lifts a 12 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 105 Cal?

    I know you use the equation, Q=mgh
    m=5.448 kg
    height = .4572m

    use these conversions instead of above.
    its easy to find Q, but what I don't know is how to find how many reps the person shoud do to lose the calories...
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Dec 3, 2009, 09:09 AM

    You have to convert joules that you got into calories, or calories required into joules required.

    Then, divide the required amount by the energy spent on each 'rep'.

    I hope it helped! :)
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