Suppose a woman does 600 J of work and -9400 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) AE int -10000 J (b) The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? % Efficiency, Eff:

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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### Energy Transfer Problem for Educational Purposes

#### Problem Statement
1. Suppose a woman does \(600 \, \text{J}\) of work and \( -9400 \, \text{J}\) of heat transfer occurs into the environment in the process.

#### Part (a)
**Question**: What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.)

**Calculation**:
\[
\Delta E_{\text{int}} = -10000 \, \text{J}
\]
A correct answer is indicated with a checkmark next to \( -10000 \, \text{J} \).

#### Part (b)
**Question**: The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency?

**Formula**:
\[
\text{Efficiency, Eff} = \frac{\text{work done (output)}}{\text{input energy}} \times 100\%
\]

An empty box is provided to fill in the efficiency percentage, indicated with a checkmark.

#### Illustrations
- No graphs or diagrams are present in the text.

This problem aims to illustrate the concept of internal energy changes and efficiency calculation in the context of energy transfer due to work done and heat transfer in a physical process.
Transcribed Image Text:### Energy Transfer Problem for Educational Purposes #### Problem Statement 1. Suppose a woman does \(600 \, \text{J}\) of work and \( -9400 \, \text{J}\) of heat transfer occurs into the environment in the process. #### Part (a) **Question**: What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) **Calculation**: \[ \Delta E_{\text{int}} = -10000 \, \text{J} \] A correct answer is indicated with a checkmark next to \( -10000 \, \text{J} \). #### Part (b) **Question**: The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? **Formula**: \[ \text{Efficiency, Eff} = \frac{\text{work done (output)}}{\text{input energy}} \times 100\% \] An empty box is provided to fill in the efficiency percentage, indicated with a checkmark. #### Illustrations - No graphs or diagrams are present in the text. This problem aims to illustrate the concept of internal energy changes and efficiency calculation in the context of energy transfer due to work done and heat transfer in a physical process.
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