Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Properties of Water- Thermal

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Properties of Water- Thermal

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Problem 5

Textbook Question

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)a. 50°Cb. 5°Cc. 100°Cd. 10°C

Verified step by step guidance

Identify the energy content of the pizza slice, which is 500 kcal.

Convert the energy from kilocalories to calories, knowing that 1 kcal = 1000 cal, so 500 kcal = 500,000 cal.

Use the formula for heat transfer: \( q = mc\Delta T \), where \( q \) is the heat energy (in calories), \( m \) is the mass of the water (in grams), \( c \) is the specific heat capacity of water (1 cal/g°C), and \( \Delta T \) is the change in temperature.

Determine the mass of the water: 50 L of water is equivalent to 50 kg, which is 50,000 g.

Rearrange the formula to solve for \( \Delta T \): \( \Delta T = \frac{q}{mc} \), and substitute the known values to find the temperature change.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Caloric Energy

Caloric energy refers to the amount of energy provided by food, measured in kilocalories (kcal). In this scenario, the pizza provides 500 kcal, which can be converted into heat energy to warm the water. Understanding how caloric energy translates into thermal energy is essential for calculating temperature changes.

Specific Heat Capacity

Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. For water, this value is approximately 4.18 J/g°C. This concept is crucial for determining how much the temperature of the water will increase when heat is added from the burning pizza.

Heat Transfer

Heat transfer is the process of thermal energy moving from one object to another due to a temperature difference. In this case, the heat generated from burning the pizza is transferred to the cold water, resulting in a temperature increase. Understanding the principles of heat transfer helps in calculating the final temperature of the water after absorbing the heat.