Question

A group of students performed an experiment to prove the law of conservation of energy. In the experiment, a flask containing water at room temperature was shaken vigorously for a few minutes. The table shows a partial record of the temperature of the water before and after shaking.

Experimental Record
Temperature
Before Shaking 20 °C
After Shaking Unknown
What best predicts the unknown temperature? (3 points)

a. Less than 20 °C because the total energy of the system after shaking is lower

b. Greater than 20 °C because the total energy of the system after shaking is higher

c. Less than 20 °C, because the mechanical energy from shaking transforms to thermal energy

d. Greater than 20 °C, because the mechanical energy from shaking transforms to thermal energy

Answer 1

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

Answer 2

Answer: The most accurate answer is Option D.

Explanation: It's actually 22 degrees. Energy cannot be created of destroyed, but transferred and transformed to one form or another. The movement of the container, mechanical energy was transferred to the water, as heat energy. Therefore is raised the water temperatures slightly.