Since energy is radiated by all objects why can't we see them in the dark? From the rules that a good absorber of radiation is a good radiator and a good reflector is a poor absorber, state a rule that relates the reflecting and radiating properties of the surface. What does the high specific heat of water have to do with convection currents in the air at the seashore?

Since energy is radiated by all objects why can't we see them in the dark? From the rules that a good absorber of radiation is a good radiator and a good reflector is a poor absorber, state a rule that relates the reflecting and radiating properties of the surface. What does the high specific heat of water have to do with convection currents in the air at the seashore?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 100P: One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a...

See similar textbooks

Similar questions

(a) Deter-nine the power of radiation from the Sun by noting that the intensity of the radiation at the distance of Earth is 1370 W/m2. Hint: That intensity will be found everywhere on a spherical surface with radius equal to that of Earth's orbit. (b) Assuring that the Sun's temperature is 5780 K and that its emissivity is 1, find its radius.
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.
Radioactive decay of granite and other rocks in Earths interior provides sufficient energy to keep the inrerior molten, to heat lava, and to provide warmth to natural hot springs.This is due to the average release of about 0.03 J per kilogram each year. Find an increase in temperature for a thermally insulated chunk of granite that takes about 13.2 million years to change temperature. (Assume that the specific heat capacity c of granite is 800 J/kg. C. Use the equation Q=cmdeltaT.
A. The planet Venus is different from the earth in several respects: (a) it is only 70 % as far from the sun, so the solar constant is 2800 W/m²; (b) its thick clouds reflect 77% of all incident sunlight and (c) its atmosphere is much more opaque to infrared light. B. (i) Estimate what the average surface temperature of Venus would be if it had no atmosphere and did not reflect any sunlight. (ii) Taking into account the reflectivity of the clouds, estimate the surface temperature. Use the theory of Earth's energy balance to discuss the greenhouse effect.
The Sun delivers radiant energy to Earth at a rate that averages approximately 1.3kW per square metre of the cross-sectional area of Earth. If we assume that all ofthis energy is absorbed by Earth (i.e., that Earth has an emissivity of one), at whatrate must Earth radiate energy if Earth’s temperature is to remain constant? Whatwould that constant temperature be? (Note: The actual temperature of Earth issomewhat higher due to the greenhouse effect of the atmosphere.)
What is the net heat current in radiation of an Ice cube at 0 °C if the surrounding air is at 20°C? The ice cube has sides of length 2.50 cm, the emissivity of ice is 0.96 and the Stefan-Boltzmann constant is o = 5.67 x 10-8 Watts/m2Kª. Is the heat flow out or into the ice cube, explain?
The nature of surfaces affects the absorption and the reflection of radiation. Assume that you are given wood for construction and asked to take two pieces of the wood o be placed in sunlight. One piece is to be painted white and the other black. Which piece will absorb more heat? If the same two pieces at room temperature are laid on he ground in the middle of the night during the narmattan in Bolgatanga in the Upper East region, which piece will cool faster? Give argument in support of your answer.
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 kcalkcal radiated to the surroundings by an adult over a 33 hh period?
Air at 22°C is blown over a hot pipe with a surface area of 3.19 m2 to dissipate 927 W of heat energy. What is the minimum convection heat transfer coefficient that will ensure that the temperature of the pipe surface is less than 45°C [round your final answer to two decimal places]? T. Air, T.
Note: please use the given formula of radiation heat transfer, and use appropriate symbols and units. Formula: Qrad = eσA(T1⁴-T2⁴)
The intensity of solar radiation reaching Mars averages about 580 W/m2. a) Assuming the Sun radiates as a blackbody, estimate the surface temperature of the Sun. b) Assuming that Mars behaves like a blackbody, how much energy is absorbed per unit time. What is its equilibrium temperature if all this energy is re-radiated back into space?
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.