Textbook Question
(c) A spherical ball of lead has a diameter of 5.0 cm. What is the mass of the sphere if lead has a density of 11.34 g>cm3? (The volume of a sphere is 14>32pr3, where r is the radius.)
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Ch.1 - Introduction: Matter, Energy, and Measurement
Chapter 1, Problem 42a
A watt is a measure of power (the rate of energy change) equal to 1 J/s. (a) Calculate the number of joules in a kilowatt-hour.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Power and Energy
Power is defined as the rate at which energy is transferred or converted. It is measured in watts (W), where 1 watt equals 1 joule per second (J/s). Understanding the relationship between power and energy is crucial for solving problems involving energy consumption and conversion.
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04:42
Power and Root Functions Example
Kilowatt-Hour
A kilowatt-hour (kWh) is a unit of energy equivalent to the energy consumed by a power of one kilowatt running for one hour. It is commonly used in electricity billing and represents a practical measure of energy usage over time, allowing for the conversion between power and energy.
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01:14Nature of Energy
Unit Conversion
Unit conversion is the process of converting a quantity expressed in one set of units to another. In this context, converting kilowatts to joules involves understanding the relationship between time and power, specifically that 1 kWh equals 1,000 watts used for 3,600 seconds, leading to the calculation of joules.
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01:56Conversion Factors
Related Practice
Textbook Question
If on a certain year, an estimated amount of 4 million metric
tons (1 metric ton = 1000 kg) of nitrous oxide 1N2O2 was
emitted worldwide due to agricultural activities, express this
mass of N2O in grams without exponential notation, using
an appropriate metric prefix.
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Textbook Question
Use of the British thermal unit (Btu) is common in some types of engineering work. A Btu is the amount of heat required to raise the temperature of 1 lb of water by 1°F. Calculate the number of joules in a Btu.
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Textbook Question
A watt is a measure of power (the rate of energy change) equal to 1 J/s. (b) An adult person radiates heat to the surroundings at about the same rate as a 100-watt electric incandescent light bulb. What is the total amount of energy in kcal radiated to the surroundings by an adult over a 24 h period?
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Textbook Question
Indicate which of the following are exact numbers: (a) the mass of a 3- by 5-in. index card, (b) the number of ounces in a pound, (c) the volume of a cup of Seattle's Best coffee, (d) the number of inches in a mile, (e) the number of microseconds in a week, (f) the number of pages in this book.
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Textbook Question
Indicate which of the following are exact numbers: (a) the mass
of a 32-oz can of coffee, (b) the number of students in your chemistry
class, (c) the temperature of the surface of the Sun, (d) the
mass of a postage stamp, (e) the number of milliliters in a cubic
meter of water, (f) the average height of NBA basketball players.
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