o: Fill in the blank with appropriate answer :1.viscosity of gases increases with temperature, whereas viscosity of liquid decreases withtemperature2.If heat energy is given to a substance and its temperature remains constant then thesubstance undergoes a change in_3. . determines the degree of hotness or coldness of a body.4 We use afor measuring the temperature of a body.5.The range of wavelength of visible light is

(1) The viscosity of the gases increases with an increase in temperature and the viscosity of the…

Answered: o: Fill in the blank with appropriate…

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 56PE: (a) Cherry-red embers in a fireplace are at 850C and have an exposed area of 0.200m2 and an...

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A 300-megawatt solar power plant requires approximately 950, 000m2 of land area in order to collect the required amount of energy from sunlight.a. If this land area is circular, what is its radius?b. If this land area is a 42◦ sector of a circle, what is its radius?
1. It turns out that the sunlight is most intense at noon. Even though this is true, explain why the highest temperature of the day usually happens a few hours afternoon. 2. A microwave oven directly heats your food with light, by using invisible microwaves to heat the water in your food. For the questions below, imagine that you put your food in the middle of your plate, and then put that plate in the microwave. a) If you heat your food for a short period of time, only the part of your plate directly underneath your food will heat up, with the rest of the plate staying cool. Explain why this happens. b) If you microwave your food for a longer time, the whole plate will heat up. Explain why this happens. 3. For each of the situations below: • List which of the three methods of heat transfer are happening in that situation. Some situations will use more than one way of transferring heat. Which of the methods do you guess transfers the most heat in that situation? • For each…
(a) Cherry-red embers in a fireplace are at 850C and have an exposed area of 0.200m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0C. 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?
1. If you have two bottles full of lake water and keep one in the dark and the other in daylight, which one would have a higher DO after a few days? Why?
1.The speed of light in vacuum is 3 X 105 km/s and 1 km = 1,000 m and 1m = 100 cm. Use c = f λ to determine the frequency of a photon with a wavelength of 2 cm. 2.At what absolute temperature (K) is Fahrenheit (F) temperature twice the Celsius temperature (C)?
Explain why :(a) a body with large reflectivity is a poor emitter(b) a brass tumbler feels much colder than a wooden tray on a chilly day(c) an optical pyrometer (for measuring high temperatures) calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot iron piece in the open, but gives a correct value for the temperature when the same piece is in the furnace.
What is zeroth law of thermal dynamics? How to confirm the thermal equivalent state? Try to explain how a thermometer work.
3) Which type of surface would most likely be the bestreflector of electromagnetic energy?A) light-colored and roughB) dark-colored and roughC) dark-colored and smoothD) light-colored and smooth 4) Which statement is the best example of heat energy transferby conduction?A) Heat energy is transferred from the bottom to the top ofthe lake.B) Heat energy is transferred from the surface soil to therocks below.C) Heat energy is transferred from the Sun to the Earth.D) Heat energy is transferred from the Earth's surface tothe upper atmosphere. 5) An object that is a good radiator of electromagnetic wavesis also a goodA) insulator from heatB) reflector of heatC) retractor of electromagnetic energyD) absorber of electromagnetic energy
Given the following measurements of mean winds and temperature from a 200-m mast inNetherlands on a September night: Table 1. Measurements of mean winds and temperature from a 200-m mast in Netherlands ona September night. Question: Solve for the Richardson number (Ri) at heights of 7.5, 15, 30, 60, 100, 140, and 180 m (note: ∂Θ/∂z at height 7.5 m is the potential temperature gradient between 5 m and 10 m).
The intensity of blackbody radiation peaks at a wavelength of 583 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature. Review Stefan's law. What is the emissivity of a blackbody? W/m2
The surface of the Sun has a temperature of5500 °C. (a) Treating the Sun as a perfect blackbody, with an emissivity of 1.0, find the power that it radiates into space. The radius ofthe Sun is 7.0 * 108m, and the temperature of space can be takento be 3.0 K. (b) The solar constant is the number of watts of sunlightpower falling on a square meter of the Earth’s upper atmosphere.Use your result from part (a) to calculate the solar constant, giventhat the distance from the Sun to the Earth is 1.5 * 1011m.
The surface area of an adult human is about 1.8 m2. Suppose a person with a skin temperature of 34°C is standing with bare skin in a room where the air is 25°C but the walls are 17°C.a. There is a “dead-air” layer next to your skin that acts as insulation. If the dead-air layer is 5.0 mm thick, what is the person’s rate of heat loss by conduction?b. What is the person’s net radiation loss to the walls? The emissivity of skin is 0.97.c. Does conduction or radiation contribute more to the total rate of energy loss?d. If the person is metabolizing food at a rate of 155 W, does the person feel comfortable, chilly, or too warm?

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