A Person Running in Place on an Exercise Machine for 10

question 21

Multiple Choice

A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories) .Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm.How many repetitions of this exercise are equivalent to 10 minutes of running in place? Assume that the person uses negligible energy in letting down the weights after each lift.(1 cal = 4.186 J)

• A)730
• B)1450
• C)1500
• D)2200
• E)2900

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Definitions:

Marginal Revenue

The additional income from selling one more unit of a good; sometimes equal to the price of the good.

Total Fixed Costs

The sum of all costs that remain constant regardless of the level of production or output in a business.

Recession

A period of declining real GDP, accompanied by lower real income and higher unemployment.

Average Fixed Cost

The fixed expenses of a business spread out over the total number of units produced, decreasing as production increases.