Question

You can make a smoothie in a blender with a power of 350 watts and an
efficiency of 75 percent. How much energy is actually being used to make the
smoothie in 120 seconds?
A. 31,500 J
B. 40,125 J
C. 38,900 J
O D. 10,500 J

Answer 1

Answer:

A. 31500 J

Explanation:

E(J) = P(W) × t(s)

Answer 2

31500J of energy is actually being used to make the smoothie in 120 seconds

What is energy ?

Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other forms . Mathematically it can defined as the power multiplies by time

given

Power = 350 watt

time = 120 seconds

Efficiency = 75%

energy = ?

efficiency = Power out / Power in

Power out = efficiency * power in

Power out = 0.75 * 350 = 262.5 J

Energy = power * time

            = 262.5 * 120

            = 31,500 J

31500J of energy is actually being used to make the smoothie in 120 seconds

correct answer is A. 31,500 J

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