1) A goose is flying south for the winter at a constant speed. Keep in mind that

Question

1) A goose is flying south for the winter at a constant speed. Keep in mind that one mile is 1.61 km , and one pound is 454 g .The goose has a mass of 22.7 lb (pounds) and is flying at 7.00 miles/h (miles per hour). What is the kinetic energy of the goose in joules?

2)For a process at constant pressure, 62,000 calories of heat are released. This quantity of heat is equivalent to

3)A slice of cheese pizza has a caloric content of 650 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

Explanation / Answer

Q1. Kinetic energy (K.E) = 1/2 mv2

m = 22.7lb = 22.7 X 454 = 10305.8g = 10.3Kg

v = 7.0miles/h = 7 X 1.61 X 1000 / 60 X 60 = 3.13 m/s

KE = 1/2 [(10.3Kg X (3.13 m/s)2] = 50.45 j

2) 1 Cal = 4.12j

Hence 62,000 calories = 62,000 X 4.12 = 255440 j

Q3 Energy = Power X time

time = energy / power

energy = 650 X 4.12 = 2678j

time = 2500 / 2678 = 0.93 s

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