Consider Joule’s apparatus described in Figure 20.1. The...

Name: Problem 2, Chapter 20: Physics for Scientists and Engineers with Modern Physics
Uploaded: 2020-12-16T21:02:38-08:00
Duration: 3 min 9 s
Channel: Shoukat Ali
Description: Consider Joule’s apparatus described in Figure 20.1. The mass of each of the two blocks is 1.50 kg, and the insulated tank is filled with 200 g of water. What is the increase in the temperature of the water after the blocks fall through a distance of 3.00 m?

Consider Joule’s apparatus described in Figure 20.1. The mass of each of the two blocks is 1.50 kg, and the insulated tank is filled with 200 g of water. What is the increase in the temperature of the water after the blocks fall through a distance of 3.00 m?

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Key Concepts

Specific Heat Capacity

Specific heat capacity is a property of a material that indicates the amount of heat energy required to raise the temperature of a unit mass of the substance by one degree. In the problem of Joule's apparatus, knowing the specific heat capacity of water is essential to calculate how much its temperature will increase when it absorbs the thermal energy generated by the falling blocks.

Gravitational Potential Energy

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is quantified by the product of an object's mass, the acceleration due to gravity, and its height above a reference level. When the blocks fall, this energy loss is available to be converted into other forms of energy, such as thermal energy in the water.

Energy Conservation

This principle states that the total energy in an isolated system remains constant. In the context of Joule's experiment, the gravitational potential energy lost by the falling blocks is converted into thermal energy in the water, which leads to a temperature increase. This concept is central to understanding how mechanical energy transformations result in heating.

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