21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 39QP
To determine
The power of the panel radiating into its surrounding.
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The temperature of the earth’s core is equal to 37270C, what is its equivalent in Kelvin scale ?
In a warm room a naked resting person has a skin temperature of 33°C if
the room temperature is 29° C, what is the body surface area if the rate of
heat loss due to convection is 43watt and the convection constant K =7.1
watt /m?.K Choose the right answer:
1.8m?
1.5m2
O 1.7m2
The following heat transfer formula quantifies the radiation emitted from the Sun:
P = eoA(T4 – T?)
Equation 5
where:
P= radiated power (Watts)
e = emissivity (=1 for ideal radiator; unitless)
o = Stefan-Boltzmann constant = 5.67x10-8 W/m2-K+
A = radiating area (m²)
T= temperature of radiator (Kelvin)
Tc = temperature of surroundings (Kelvin)
Q3 Using the following values, together with equation 5, calculate the power emitted by the Sun.
sun's surface temperature = 5780 K
temperature of the environment that the Sun is located in = 4 K
emissivity of the Sun = 1
radius of the Sun = 695,700,000 m
Stephen-Boltzmann constant o = 5.67 x 10-8 W/m2-K4
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Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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