you can make a smoothie in a blender with a power of 300 watts and an efficiency of 80 percent. how much…

you can make a smoothie in a blender with a power of 300 watts and an efficiency of 80 percent. how much energy is actually being used to make the smoothie in 180 seconds?\n\na. 43,200 j\nb. 52,060 j\nc. 10,800 j\nd. 45,875 j

you can make a smoothie in a blender with a power of 300 watts and an efficiency of 80 percent. how much energy is actually being used to make the smoothie in 180 seconds?\n\na. 43,200 j\nb. 52,060 j\nc. 10,800 j\nd. 45,875 j

Answer

Explanation:

Step1: Calculate total input energy

The formula for energy is $E = P\times t$, where $P = 300$ W and $t=180$ s. So $E_{input}=300\times180 = 54000$ J.

Step2: Calculate actual (useful) energy

The efficiency $\eta = 80%=0.8$. The formula for efficiency is $\eta=\frac{E_{output}}{E_{input}}$. So $E_{output}=\eta\times E_{input}=0.8\times54000 = 43200$ J.

Answer:

A. 43,200 J