Conceptual Integrated Science
3rd Edition
ISBN: 9780135197394
Author: Hewitt, Paul G., LYONS, Suzanne, (science Teacher), Suchocki, John, Yeh, Jennifer (jennifer Jean)
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 6, Problem 97TE
To determine
To state:
A relationship between a reflector and
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(a) Cherry-red embers in a fireplace are at 850ºC and have an exposed area of 0.200 m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0ºC . If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts?
(b) Does your answer support the contention that most of the heat transfer into a room by a fireplace comes from infrared radiation?
james investigated heat conduction in copper and plastic to find out which is a better insulator.He used Vaseline to stick a drawing pin to the of a bar made of copper and bar made of plastic.Each bar is 10cm long dameter of 1cm.James held the ends without the drawing pin over a Bunsen burner flame with a pair of tongs.He recored how long it took for each drawing pin to drop.
Which variable was measured and which instrument is suitable for measuring the variables you mentioned.
Which variable was changed.
Tell us how James could tell from his results which substance is the better insulator.
Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C.
Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature
of 300 K.
Chapter 6 Solutions
Conceptual Integrated Science
Ch. 6 - Prob. 1RCQCh. 6 - Why does a penny become warmer when it is struck...Ch. 6 - What are the temperatures for freezing water on...Ch. 6 - Is the temperature of an object a measure of the...Ch. 6 - What is meant by the following statement? A...Ch. 6 - What pressure would you expect in a rigid...Ch. 6 - How much energy can be removed from a system at a...Ch. 6 - When you touch a cold surface, does cold travel...Ch. 6 - a Distinguish between temperature and heat. b...Ch. 6 - What determines the direction of heat flow?
Ch. 6 - Distinguish between a calorie and a Calorie, and...Ch. 6 - How does the law of conservation of energy relate...Ch. 6 - Prob. 13RCQCh. 6 - How does the second law of thermodynamics relate...Ch. 6 - Which warms up faster when heat is appliediron or...Ch. 6 - Does a substance that heats up quickly have a high...Ch. 6 - How does that specific heat capacity of water...Ch. 6 - Which generally expands more for an equal increase...Ch. 6 - Prob. 19RCQCh. 6 - Why does ice form at the surface of a pond instead...Ch. 6 - What is the role of loose electrons in heat...Ch. 6 - Distinguish between a heat conductor and a heat...Ch. 6 - Why is a barefoot fire walker able to walk safely...Ch. 6 - Why are such materials as wood, fur, and feathers ...Ch. 6 - Describe how convection transfers heat.Ch. 6 - What happens to the temperature of air when it...Ch. 6 - Why does the direction of coastal winds change...Ch. 6 - a What exactly is radiant energy? b What is heat...Ch. 6 - How does the frequency of radiant energy relate to...Ch. 6 - Prob. 30RCQCh. 6 - What does it mean to say that energy becomes less...Ch. 6 - What is the physicists term for the measure of...Ch. 6 - Consider the decomposition of water (H2O) to form...Ch. 6 - A deer is a more concentrated form of energy than...Ch. 6 - Northeastern Canada and much of Europe receive...Ch. 6 - Iceland, so named to discourage conquest by...Ch. 6 - Why does the presence of large bodies of water...Ch. 6 - Show that 5000cal is required to increase the...Ch. 6 - Calculate the quantity of heat absorbed by 20g of...Ch. 6 - Show that a 100-m-long piece of copper wire will...Ch. 6 - A steel section of the Alaska pipeline was...Ch. 6 - Prob. 47TCCh. 6 - The precise volume of water in a beaker depends on...Ch. 6 - From best to worst, rank these materials as heat...Ch. 6 - From greatest to least, rank the frequencies of...Ch. 6 - Show that the final temperature of a mixture of...Ch. 6 - Prob. 52TSCh. 6 - When 2kg of 40C iron nails are submerged in 2kg of...Ch. 6 - Show that the heats require to raise the...Ch. 6 - Suppose the 1300-meter steel span of the Golden...Ch. 6 - The steel Sutro Tower in San Francisco is...Ch. 6 - A steel section of the Alaska pipeline was...Ch. 6 - Imagine people breathing on the length of a...Ch. 6 - Show that when the thermal energy of a volume of...Ch. 6 - Pounding a nail into wood makes the nail warmer....Ch. 6 - Prob. 61TECh. 6 - Which is greater an increase in temperature of 1C...Ch. 6 - A friend says that molecules in a...Ch. 6 - What is the lowest temperature in nature in...Ch. 6 - Will a volume of gas shrink or will it expand when...Ch. 6 - If a gas at 0C is cooled to 100C, by how much...Ch. 6 - What is the name given to "thermal energy in...Ch. 6 - Instead of saying that a red-hot nail, it is...Ch. 6 - What is the general direction of the flow of...Ch. 6 - Which has the greatest amount of thermal energy:...Ch. 6 - If 100joules of heat are added to a system that...Ch. 6 - If 100joules of heat are added to a system that...Ch. 6 - Which law of thermodynamics relates to a the most...Ch. 6 - Prob. 74TECh. 6 - For the same mass, which has the greater specific...Ch. 6 - Which undergoes a greater change in temperature...Ch. 6 - Why will watermelon stay cool for a longer time...Ch. 6 - Prob. 78TECh. 6 - While camping in a tent on a cold night, which...Ch. 6 - Why do the Hawaiian Islands and San Francisco not...Ch. 6 - An old method for breaking boulders was to put...Ch. 6 - A metal ball is just able to pass through a metal...Ch. 6 - After a machinist very quickly slips a hot, snugly...Ch. 6 - Why is it important to protect water pipes so that...Ch. 6 - Prob. 85TECh. 6 - Cite an exception to the claim that all substances...Ch. 6 - If there are any parcels of 4C water in a pond, in...Ch. 6 - If you hold one end of a nail against a piece of...Ch. 6 - Which will cool your finger faster, touching a...Ch. 6 - Later we'll learn that electrical conductors such...Ch. 6 - How does the buoyancy typical in fluids relate to...Ch. 6 - When air is rapidly compressed, why does its...Ch. 6 - Why is your hand cooled when you blow air through...Ch. 6 - Why is Millies hand not burned when she holds it...Ch. 6 - The formula fT tells us that any object with any...Ch. 6 - If everything absorbs radiation, then why doesnt...Ch. 6 - Prob. 97TECh. 6 - Why do the pupils of eyes appear black? When do...Ch. 6 - Wrap part of a fur coat around a thermometer....Ch. 6 - In your room, there are tables, chairs, other...Ch. 6 - Discuss why you cant establish whether you are...Ch. 6 - If you drop a hot rock into a pail of water, the...Ch. 6 - Visit a snow-covered cemetery and note that the...Ch. 6 - Friends in your discussion group say that when you...Ch. 6 - Prob. 105TDICh. 6 - Prob. 106TDICh. 6 - When scientists discuss kinetic energy per...Ch. 6 - Prob. 2RATCh. 6 - Your garage gets messier every day. In this case,...Ch. 6 - A substance that heats up relatively quickly has a...Ch. 6 - A bimetallic strip used in thermostats relies on...Ch. 6 - Water at 4C will expand when it is a slightly...Ch. 6 - A fire walker walking barefoot across red-hot...Ch. 6 - Thermal convection is linked mostly to a radiant...Ch. 6 - Which of these electromagnetic waves has the...Ch. 6 - Compared with terrestrial radiation, the radiation...
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- One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another.arrow_forwardFor the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)arrow_forwardCompare the SI units of specific heat and latent heat and explain any differences.arrow_forward
- Compare the rate of heat conduction through a 13.0-cm-thick wall that has an area of 10.0 m2 and a thermal conductivity that of glass wool with the rate of heat conduction through a 0.750-cm-thick window that has an area of 2.00 m2, assuming the same temperature difference across each.arrow_forwardAn astronaut performing an extra-vehicular activity (space walk) shaded from the Sun is wearing a spacesuit that can be approximated as perfectly white ( e=0 ) except for a 5 cm × 8 cm patch in the form of the astronaut's national flag. The patch has emissivity 0.300. The spacesuit under the patch is 0.500 cm thick, with a thermal conductivity k 0.0600 W/m , and its inner surface is at a temperature of 20.0 . What is the temperature of the patch, and what is the rate of heat loss through it? Assume the patch is so thin that its outer surface is at the same temperature as the outer surface of the spacesuit under it. Also assume the temperature of outer space is 0 K. You will get an equation that is very hand to solve in closed form, so can solve it numerically with a graphing calculator, with software, or even by trial and error with a calculator.arrow_forwardWhy is a person able to remove a piece of dry aluminum foil from a hot oven with bare fingers, whereas a burn results if there is moisture on the foil?arrow_forward
- An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.arrow_forwardDescribe a situation in which heat transfer occurs.arrow_forwardAn unused wood-burning stove has a constant temperature of 18 °C (291 K), which is also the temperature of the room in which the stove stands. The stove has an emissivity of 0.900 and a surface area of 3.50 m2. What is the net radiant power generated by the stove?arrow_forward
- After sunset, radiant energy can be sensed by a person standing near a brick wall. Such walls frequently have surface temperatures around 44C and typical emissivity values of brick walls are on the order of 0.92. What would be the radiant thermal flux per square foot from a brick wall at this temperature?arrow_forwardIf 49% of the radiation that reaches the atmosphere is scattered or absorbed before reaching to the surface of the earth and the average albedo of the earth is 0.39. How much is radiation absorbed, reflected, emitted and net from the earth's surface, if it is known that the temperature Earth's average is 290 ° K and the emissivity is 0.95?arrow_forwardA surface of area 0.5 m2, emissivity 0.8, and temperature 150°C is placed in a large, evacuated chamber whose walls are maintained at 25°C. What is the rate at which radiation is emitted by the surface?arrow_forward
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