Under what conditions will a puddle of water evaporate more quickly? A. A windy day in January with the temperature at 39 °F. B. A dry, windy day in July with the temperature at 89 °F. C. A calm day in January with the temperature at 37 °F. D. A humid, still day in July with the temperature at 86 °F just before it rains.

Under what conditions will a puddle of water evaporate more quickly? A. A windy day in January with the temperature at 39 °F. B. A dry, windy day in July with the temperature at 89 °F. C. A calm day in January with the temperature at 37 °F. D. A humid, still day in July with the temperature at 86 °F just before it rains.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter14: Heat And Heat Transfer Methods

Section: Chapter Questions

Problem 54PE: A glass coffee pot has a circular bottom with a 9.00-cm diameter in contact with a heating element...

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(a) How many kilograms of water must evaporate from a 60.0-kg woman to lower her body temperature by 0.750C ? (b) Is this a reasonable amount of water to evaporate in the form of perspiration, assuming the relative humidity of the surrounding air is low?
. On a winter day, the air temperature is — 15°C, and the humidity is 0,001 kg/m3. (a) What is the relative humidity? (b) When this air is brought inside a building, it is heated to 20°C. If the humidity isn't changed, what is the relative humidity inside the building?
(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a 1.40m2 surface area? Assume that the animal’s skin temperature is 32.0C, that tile air temperature is 5.00C, and that fur has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?
(a) At what temperature does water boil at an altitude of 1500 m (about 5000 ft) on a day when atmospheric pressure is 8.59104N/m2 ? (b) What about at an altitude of 3000 m (about 10,000 ft) when atmospheric pressure is 7.00104N/m2 ?
(a) What is me vapor pressure of water at 20.0C ? (b) What percentage of atmospheric pressure does this correspond to? (c) What percent of 20.0C air is water vapor if it has 100% relative humidity? (The density of dry air at 20.0C is 1.20kg/m3 .)
(a) How much heat transfer is required to raise the temperature of a 0.750kg aluminum pot containing 2.50 kg of water from 30.0C to the boiling point and then boil away 0.750 kg of water? (b) How long does this take if the rate of heat transfer is 500 W 1watt=ljoule/second(lW=lJ/s) ?
A glass coffee pot has a circular bottom with a 9.00-cm diameter in contact with a heating element that keeps the coffee warm with a continuous heat transfer rate of 50.0 W (a) What is the temperature of the bottom of the pot, if it is 3.00 mm thick and the inside temperature is 60.0C ? (b) If the temperature of the coffee remains constant and all of the heat transfer is removed by evaporation, how many grams per minute evaporate? Take the heat of vaporization to be 2340kJ/kg.
Unreasonable Results Suppose the relative humidity is 80% on a day when the temperature is 30.0C. (a) What will the relative humidity be if the air cools to 25.0C and the vapor density remains constant? (b) What is unreasonable about this result? (c) Which premise is responsible?
1. On a sunny day, Emma is cutting branches from a tree in her yard. At midday, she takes a break, leaving a pile of branches and leaves on the ground. When she returns and gathers the branches, she notices the leaves are wilted and crisp. Which of the following correctly describes what happened to the leaves? A. The trees had not received water for a long time before being cut. B. The warm temperature caused moisture to evaporate from the leaves. C. The nutrients cannot reach the leaves if the tree's branches are not upright. D. The leaves had been covered in frost the week before, but had not wilted until now. Explanation:
1 an athlete can run a marathon in 2 hours 15. minutes on a dry day in outside temperature up to 35 °C. If the air is dry, his body will not overheat. ln humid conditions the same athlete can run the marathon at the same time. However, in humid conditions, if the outside temperature goes over 18°C then his body will overheat. Suggest an explanation for the athlete overheating in humid conditions
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2) A hot-air balloon can carry mass about the difference between the mass of air displaced by the balloon and the mass of the gas inside the balloon. A scientist wants to investigate mass lifting using a sphere balloon, 4.00 m in diameter and heated air at 70 °C at Kapadokva. The air temperature and atmospheric pressure at Kapadokya are 25 °C and 755 torr. The pressure in the balloon is also equal to the atmospheric pressure. a. What total mass can the balloon lift? Assume that the average molar mass of air is 29.0 g/mol. (Hint: Heated air is less dense than cool air.) b. If the balloon is filled with enough helium (4.003 g/mol) at 25 °C and 755 torr to achieve the same volume as in part a, what total mass can the balloon lift?