Please show every step of the soultion for this one question: Please show every

Question

Please show every step of the soultion for this one question:

Please show every step of the soultion for this one question: It is 5.0 km from your home to (he physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W). Which choice would burn up more energy, and how much energy (in joules) would it burn? Why is it that the more intense exercise actually burns up less energy than the less intense exercise?

Explanation / Answer

Your office is 5km away. If you run there at 10km/h it will take you 30 min to get there. Since it uses 700W per hour and you only run for half an hour, you use 350W running. When you walk, you have a speed of 3km/h. To get to the lab, which is 5km away, you need to walk for 1.67 hours. Since you use 290W per hour and you walk for 1.67 hours (290*1.67) you use 483.3 Watt to get to the office. The more intense exercise takes less time and that is why it ends up using less energy.

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