A 2m tall athlete weighing 90kg is exercising the knee extensor muscles while sitting on a bench. A 30kg weight is placed on the leg 0.40m from the center of motion of the knee joint. (a) Calculate the moment the knee extensor muscles must counteract at full extension and 60 degree of knee flexion. Consider the weight of the lower leg and the foot separately, and use the anthropometric data given below to get the relevant properties needed for the calculations. In each case consider the muscular line of

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Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.