Question

jessie and jaime complete a 7.0km race. each has a mass of 68 kg . jessie runs the race at 15 km/h ; jaime walks it at 5.0 km/h . use the table below. how much metabolic energy does jessie use to complete the course?

Answer 1

To calculate the metabolic energy used by Jessie to complete the course, we need to find the time taken and convert it to seconds. Then, we can calculate the metabolic energy using the power output and time.

Step-by-step explanation:

To calculate the metabolic energy used by Jessie to complete the course, we need to first find the time it takes for her to complete the race. We can use the formula time = distance/speed. For Jessie, the time taken can be calculated as 7.0 km / 15 km/h = 0.467 hours (rounded to three decimal places).

Next, we need to convert the time from hours to seconds, as the given energy rate is in watts. There are 3600 seconds in one hour. So, the time taken by Jessie is 0.467 hours * 3600 seconds/hour = 1680 seconds (rounded to the nearest whole number).

Finally, we can calculate the metabolic energy using the formula energy = power * time. Given that Jessie's mass is 68 kg and the power output is 850 W, the metabolic energy used by Jessie to complete the course is 850 W * 1680 s = 1,428,000 joules (rounded to the nearest whole number).