College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 14, Problem 24CQ
Why are cloudy nights generally warmer than clear ones?
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Chapter 14 Solutions
College Physics
Ch. 14 - How is heat transfer related to temperature?Ch. 14 - Describe a situation in which heat transfer...Ch. 14 - When heal transfers into a system, is the energy...Ch. 14 - What three factors affect the heat transfer that...Ch. 14 - The brakes in a car increase in temperature by T...Ch. 14 - Heat transfer can cause temperature and phase...Ch. 14 - How does the latent heat of fusion of water help...Ch. 14 - What is me temperature of ice right after it is...Ch. 14 - If you place 0C ice into 0C water in an insulated...Ch. 14 - What effect does condensation on a glass of ice...
Ch. 14 - In my humid climates where there are numerous...Ch. 14 - In winters, if is often warmer in San Francisco...Ch. 14 - Putting a lid on a boiling pot greatly reduces the...Ch. 14 - Freeze-dried toads have been dehydrated in a...Ch. 14 - When still air cools by radiating at night, it is...Ch. 14 - In a physics classroom demonstration, an...Ch. 14 - What are the main methods of heat transfer front...Ch. 14 - Some electric sieves have a flat ceramic surface...Ch. 14 - Loosefitting white clothing covering most at the...Ch. 14 - One way to make a fireplace more energy efficient...Ch. 14 - On cold, clear nights horses will sleep under the...Ch. 14 - When watching a daytime circus in a large,...Ch. 14 - Satellites designed to observe me radiation from...Ch. 14 - Why are cloudy nights generally warmer than clear...Ch. 14 - Why are thermometers that are used in weather...Ch. 14 - On average, would Earth be warmer or cooler...Ch. 14 - On a hot day, the temperature of an 80,000L...Ch. 14 - Show that 1cal/gC=1kcal/kgC.Ch. 14 - To sterilize a 50.0g glass baby bottle, we must...Ch. 14 - The same heat transfer into identical masses of...Ch. 14 - Rubbing your hands together warms them by...Ch. 14 - A 0.250kg block at a pure material is heated from...Ch. 14 - Suppose identical amounts of heat transfer into...Ch. 14 - (a) The number of kilocalories in food is...Ch. 14 - Following Vigorous exercise, the body temperature...Ch. 14 - Even when shut down after a period of normal use,...Ch. 14 - How much heat transfer (in kilocalories) is...Ch. 14 - A bag containing 0C ice is much more effective in...Ch. 14 - (a) How much heat transfer is required to raise...Ch. 14 - The formation of condensation on a glass of ice...Ch. 14 - On a trip, you notice that a 3.50kg bag of ice...Ch. 14 - On a certain dry sunny day, a swimming pool’s...Ch. 14 - (a) How much heat transfer is necessary to raise...Ch. 14 - In 1986, a gargantuan iceberg broke away from the...Ch. 14 - How many grams of coffee must evaporate from 350 g...Ch. 14 - (a) It is difficult to extinguish a fire on a...Ch. 14 - The energy released from condensation in...Ch. 14 - To help prevent from damage, 4.00 kg at 0C water...Ch. 14 - A 0.250kg aluminum bowl holding 0.800 kg of soup...Ch. 14 - A 0.0500kg ice cube at 30.0C is placed in 0.400 kg...Ch. 14 - If you pour 0.0100 kg of 20.0C water onto a 1.20kg...Ch. 14 - Indigenous people sometimes cook in watertight...Ch. 14 - What would be the final temperature of the pan and...Ch. 14 - In some countries, liquid nitrogen is used on...Ch. 14 - Some gun fanciers make their own bullets, which...Ch. 14 - (a) Calculate the rate of heat conduction through...Ch. 14 - The rate of heat conduction out of a window on a...Ch. 14 - Calculate the rate of heat conduction out of the...Ch. 14 - Suppose you stand with one foot on ceramic...Ch. 14 - A man consumes 3000 kcal of food in one day....Ch. 14 - (a) A firewalker runs across a bed of hot coals...Ch. 14 - (a) What is the rate of heat conduction through...Ch. 14 - A walrus transfers energy by conduction through...Ch. 14 - Compare the rate of heat conduction through a...Ch. 14 - Suppose a person is covered head to foot by wool...Ch. 14 - Some stove tops are smooth ceramic for easy...Ch. 14 - One easy way to reduce heating (and cooling) costs...Ch. 14 - (a) Calculate the rate of heat conduction through...Ch. 14 - Many decisions are made on the basis of the...Ch. 14 - For the human body, what is the rate of heat...Ch. 14 - At what wind speed does 10C air cause the same...Ch. 14 - At what temperature does still air cause the same...Ch. 14 - The “steam” above a freshly made cup of instant...Ch. 14 - (a) How many kilograms of water must evaporate...Ch. 14 - On a hot dry day, evaporation from a lake has just...Ch. 14 - One winter day, the climate control system of a...Ch. 14 - The Kilauea volcano in Hawaii is the world’s most...Ch. 14 - During heavy exercise, the body pumps 2.00 L of...Ch. 14 - A person inhales and exhales 2.00 L of 37.0C air,...Ch. 14 - A glass coffee pot has a circular bottom with a...Ch. 14 - At what net rate does heat radiate from a 275m2...Ch. 14 - (a) Cherry-red embers in a fireplace are at 850C...Ch. 14 - Radiation makes it impossible to stand close to a...Ch. 14 - (a) Calculate the rate of heat transfer by...Ch. 14 - Find the net rate of heat transfer by radiation...Ch. 14 - Suppose you walk into a sauna that has an ambient...Ch. 14 - Thermography is a technique for measuring radiant...Ch. 14 - The Sun radiates like a perfect black body with an...Ch. 14 - A large body of lava from a volcano has stopped...Ch. 14 - Calculate the temperature the entire sky would...Ch. 14 - (a) A shirtless rider under a circus tent feels...Ch. 14 - Integrated Concepts One 30.0C day the relative...Ch. 14 - Integrated Concepts Large meteors sometimes strike...Ch. 14 - Integrated Concepts Frozen waste from airplane...Ch. 14 - €69. Integrated Concepts (a) A large electrical...Ch. 14 - Integrated Concepts (a) Suppose you start a...Ch. 14 - Integrated Concepts A 76.0-kg person suffering...Ch. 14 - Integrated Concepts In certain large geographic...Ch. 14 - Integrated Concepts Heat transfers from your lungs...Ch. 14 - Integrated Concepts (a) What is the temperature...Ch. 14 - Integrated Concepts Hot air rises because it has...Ch. 14 - Unreasonable Results (a) What is the temperature...Ch. 14 - Unreasonable Results A slightly deranged Arctic...Ch. 14 - Unreasonable Results (a) Calculate the rate of...Ch. 14 - Unreasonable Results A meteorite 1.20 cm in...Ch. 14 - Construct Your Own Problem Consider a new model of...Ch. 14 - Construct Your Own Problem Consider a person...
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- 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_forwardThe temperature in Boston was 40°F when it was 80°F in St. Petersburg, FL. What is your response to a friend who suggests that it was twice as hot in St. Petersburg on that day?arrow_forwardExample: A water tank with a wall thickness of 10 mm and a water temperature of 90 "C.) Calculate the average heat loss per square meter (unit area) if the ambient air temperature is 15 "C. Take the thermal conductivity coefficient of the wall material 50 W / m C, the water heat-convection coefficient of 2800 W/m2°Cand the heat-convection coefficient of the ambient air 11 W/m2°C. Calculate the two temperatures of the wall surfaces.arrow_forward
- Consider a car radiator at 112°C in a 47.5°C environment and the exchange of heat between them by radiation. Calculate the net rate of heat transfer, in watts, by radiation from the car's radiator, if it has an emissivity of 0.750 and a 1.5-m2 surface area. Q/Δt =arrow_forwardWhen night falls, the temperature of the earth’s surface starts to drop. On a cool night, dew starts to form on the grass as water vapor condenses. Once dew starts to form, the rate of temperature decrease slows. Explain why this change occurs.arrow_forwardOn a winter day when the air temperature is 0 °C, the relative humidity is 50% . Outside air comes inside and is heated to a room temperature of 20 °C . What is the relative humidity of the air inside the room. (Does this problem show why inside air is so dry in winter?)arrow_forward
- On a chilly 10°C day, your friend who loves cold weather says she wishes it were twice as cold. Taking this literally, show that the temperature she wishes for would be −131.5°C.arrow_forwardName 1. From base to torch, the Statue of Liberty is 46.1 m tall. How much taller is the monument on a 27 °C summer day than on a 3.3 OC winter day? (The Statue of Liberty is made of copper; its coefficient of thermal expansion is 16.7 x 10-6/°C.) it fille to the brim with water during a thunderstorm. Ifarrow_forwardOn a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 34°C for the rest of the afternoon. If the time constant for the building is 5 hr, what will be the temperature inside the building at 3:00 P.M.? At 5:00 P.M.? When will the temperature inside the building reach 26°C? RIB °C. At 3:00 P.M., the temperature inside the building will be about (Round to the nearest tenth as needed.)arrow_forward
- On a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 34°C for the rest of the afternoon. If the time constant for the building is 5 hr, what will be the temperature inside the building at 4:00 P.M.? At 6:00 P.M.? When will the temperature inside the building reach 26°C? At 4:00 P.M., the temperature inside the building will be about (Round to the nearest tenth as needed.) 1°C.arrow_forwardAt night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward; the much cooler sky above radiates much less. Patches of ground under trees can stay warmer, which is why, if you live somewhere that has cold, clear nights, you may have noticed some mornings when there is frost on open patches of ground but not under trees. Why does being under a tree keep the ground warmer?arrow_forwardat beach, you can get a sunburn while under the shade of an umbrella.What is your explanation?arrow_forward
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