Question 1

Identify the variables given in the situation above.

Accepted Answer

m=70kg, t(a)=500s, t(b)=450s, t(c)=425s

Answer

m=70kg, t(a)=500s, t(b)=425s, t(c)=450s

Answer

m=70kg, t(a)=450s, t(b)=500s, t(c)=425s

Answer

m=500kg, t(a)=70s, t(b)=450s, t(c)=425s

Question 2

What is necessary and missing to solve for how much work each runner has done?

Accepted Answer

displacement

Answer

Kinetic energy

Answer

velocity

Answer

acceleration

Question 3

Which runner has the most power?

Accepted Answer

Runner C

Answer

Runner B

Answer

Same power

Answer

Runner A

Question 4

If the displacement for the runners from start to finish is 500m, how much power does each runner have? (a=9.8m/s^2)

Accepted Answer

P(a)=686W, P(b)=762.2W, P(c)=807.06W

Answer

P(a)=807.06W, P(b)=762.2W, P(c)=686W

Answer

P(a)=70W, P(b)=77.8W, P(c)=82.35W

Answer

P(a)=82.35W, P(b)=77.8W, P(c)=70W

Question 5

Explain how we can inference the difference in power with only the information that was provided.

Accepted Answer

We know that the displacement (not distance) was the same for each runner, so we can infer that the work done by each runner was the same since they have equal masses so the they use the same force to move their bodies. If they do the same work, then the runner who gets to the top faster has more power (P=W/t).

Answer

You can't infer the difference in power

Answer

e=mc^2

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