Constants Part A On flat ground, a 70-kg person requires about 300 W of metaboli

Question

Constants Part A On flat ground, a 70-kg person requires about 300 W of metabolic power to walk at a steady pace of 5.0 km/h (1.4 m/s). Using the same metabolic power output, that person can bicycle over the same ground at 15 km/h. A 70-kg person walks at a steady pace of 5.0 km/h on a treadmil at a 5.0% grade. (That is, the vertical distance covered is 5.0% of the horizontal distance covered.) If we assume the metabolic power required is equal to that required for walking on a flat surface plus the rate of doing work for the vertical climb, how much power is required? O 300 W 315 W 350 W O 370 w Submit Request Answer

Explanation / Answer

(A) along the incline,

tan(theta) = 0.05 => theta = 2.86 deg

f = m g sin(2.86) = 70 x 9.8 x sin(2.86)

f = 34.3 N

and P = f.v = 34.3 x 1.4 = 48 Watt

total power = 300 + 48 = 348 Watt

Ans: 350 Watt

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