Question

Which of these is an experiment generally regarded as being first carried out by James Joule?

observing that objects increase in temperature when heated with fire

showing that friction slows down the motion of objects

measuring the temperature increase of water from doing work stirring it

testing the mechanical advantage of pulleys

What did Joule's experiment directly show?

The temperature of water increases from the addition of heat.

Heat is a form of energy.

Heat can be neither created nor destroyed.

Electromagnetic radiation has energy

Answer 1

Answer 1: The correct answer is: 'measuring the temperature increase of water from doing work stirring it'.

Answer 2: The correct answer is :'Heat is a form of energy'.

Step-by-step explanation:

In his experiment he took three fluids : water, oil, mercury in an insulating container with stirrer agitated in the fluid.

He measured the amount of work done by the rotating stirrer in the fluid and the temperature rise in the fluid due to the rotation of the stirrer was also observed.

From his observation he concluded that the heat possessed by the fluid and work done on the fluid is directly linked to each other. Which he put down is simple words "heat is a form of energy"

Answer 2

1. The correct answer among the choices provided is the third option. Measuring the temperature increase of water from doing work by stirring it is an experiment generally regarded as being first carried out by James Joule.
2. Joule's experiment directly shows that heat is a form of energy. He wanted to make a different way of measuring energy.