Physics Core/AP 1 and 2

Homework

# Physics 14: 1-4 Heat Transfer and Specific HeatE

## Homework

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 14: 1-4

##### Study Points
• 14:1: The units of heat, calories, can be converted to more common energy units, joules, by recognizing that an amount of heat energy can do work at the rate of 4.186 Joules per calorie.
• 14:2: The internal energy of a gas depends on the average speed of the molecules in the gas, and is directly related to the temperature of the gas, as U = N * (KE) = 3/2 NkT = 3/2 nRT where N is measured in atoms or molecules, and n is measured in moles.
• 14:3: The rate at which a substance can absorb or lose heat is its heat capacity. The amount of flowing in or out of a sample depends on the amount of the sample, the heat capacity, and the change in temperature: q = m * c * δT.
• 14:4: Calorimetry provides a way of measuring heat capacity. A heated or chillled sample is placed in an insulated water bath, and the bath temperature is monitored until it stops changing. Because of conservation of energy, the heat lost or gained by the water bath must be the heat gained or lost by the sample.

### Key Equations

• Internal energy of an Ideal Gas
• Specific Heat of a substance

### Web Lecture

Read the following weblecture before chat: Heat Transfer and Internal Energy

### Study Activity

Energy2D is a downloadable physics program that has been funded by the National Science Foundation. It allows you to create heat transfer simulations.

There are simulations already created on the site. Take a look Heat Transfer Models. Download and play with one of the models. (you will first nead to download the program). For example, determine how the heat flows via conduction. Which burner produces the most heat? How fast does the water heat up on each burner?

If you have an older browser, you may be able to run Java applets in the browser; however, since June 2018, no popular browser will run Java natively any more.

### Chat Preparation Activities

• Forum question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
• Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.

### Chapter Quiz

• The chapter quiz is not yet due.

### Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!