Explanation:
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The answer is A because potential energy is stored up energy which means that it’s not moving
<u>Answer:</u>
148.4 J
<u>Explanation:</u>
We are given that the efficiency of a pulley system is 74.2% and we are to calculate the useful work done if we perform 200 J of work
We know that efficiency is basically the measure of how efficient a process is.
The formula of efficiency is given by:
<em>Efficiency = useful energy output / total energy input</em>
So substituting the given values in the above formula:
0.742 = Useful energy / 200 J
Useful energy = 148.4 J
Answer: Frost
Explanation: Frost is the deposition of ice, that develops after the freezing of the water vapor. It most commonly appears on the surfaces of the ground and can be observed as fragile crystals of ice. These can be observed on the window panes, blades of the grass, or any other solid exposed surface. The window frost develops when a pane of glass is exposed to below freezing temperature from the outer surrounding and the moist air from inside.