A slice of cheese pizza has a caloric content of 550 Cal.If this energy could be used to power a 2500 Watt microwave oven,how many minutes could the microwave oven be operated? 1 W = 1 J/s

Question

Quizplus · Accepted Answer

We need to first convert the calories to Joules:

550 Cal = 550 * 4.184 kJ = 2302 kJ

Now we can use the power and energy relationship:

Energy = Power x Time

Time = Energy / Power

Time = 2302 kJ / 2500 W

Time = 0.9208 hours

We need to convert hours to minutes:

Time = 0.9208 hours x 60 minutes/hour

Time ≈ 55.25 minutes ≈ 15.3 minutes (rounded to one decimal place)

Therefore, the microwave oven could be operated for approximately 15.3 minutes with the energy from a slice of cheese pizza. The best choice is B.

A Slice of Cheese Pizza Has a Caloric Content of 550