Homework Answers
1. The "surface" of the Sun is not sharp boundaries like the surface of the Earth....
1. The "surface" of the Sun is not sharp boundaries like the surface of the Earth. Most of the radiation that the Sun emits is in thermal equilibrium with the hot gases that make up the Sun's outer layers. Without too much error, we can treat sunlight as blackbody radiation. The total power radiated by the Sun is 3.87×1026W. Given the radius of the Sun is 6.96×108m, what is the surface temperature of the Sun? Suppose the temperature of the...
The amount of radiant power produced by the sun is approximately 3.9 × 1026 W. Assuming...
The amount of radiant power produced by the sun is approximately 3.9 × 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 × 108 m, find its surface temperature (in kelvins).
Use the following information for the next three questions: The sun has a radius of 695,700...
Use the following information for the next three questions: The sun has a radius of 695,700 km and emits blackbody radiation at a temperature of 5778 K. Assuming that all of the sun's radiation is emitted at the peak wavelength, find the number of photons emitted by the sun per second. 9.7 x 1014 9.7 x 1024 9.7 x 1044
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
RACTICE IT se the worked example above to help you solve this problem. Assume that the...
RACTICE IT se the worked example above to help you solve this problem. Assume that the Sun delivers an average power per unit area of about 1000 W/m2 to Earth's surface. (a) Calculate the total power incident on a flat tin roof 7.66 m by 23.4 m. Assume that the radiation is incident nomal (perpendicular) to the roof 179244 (b) The tin roof reflects some light, and convection, conduction and radiation transport the rest of the thermal energy away, until...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Please use the formulate sheet and show all steps to make sure the question is worth...
Please use the formulate sheet and show all steps to make sure
the question is worth any points
a) The initial ratio of deuterium (D) to hydrogen (H) in a planet's atmosphere was 175000; however, the present ratio is 1/1500 and the initial and final abundances of D are 5 x 10° atoms per m3 and 9 x 106 atoms per m2, respectively. What fraction of deuterium has been lost, and what fraction of hydrogen has been lost in this...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
RACTICE IT se the worked example above to help you solve this problem. Assume that the Sun delivers an average power per unit area of about 1000 W/m2 to Earth's surface. (a) Calculate the total power incident on a flat tin roof 7.66 m by 23.4 m. Assume that the radiation is incident nomal (perpendicular) to the roof 179244 (b) The tin roof reflects some light, and convection, conduction and radiation transport the rest of the thermal energy away, until...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Please use the formulate sheet and show all steps to make sure
the question is worth any points
a) The initial ratio of deuterium (D) to hydrogen (H) in a planet's atmosphere was 175000; however, the present ratio is 1/1500 and the initial and final abundances of D are 5 x 10° atoms per m3 and 9 x 106 atoms per m2, respectively. What fraction of deuterium has been lost, and what fraction of hydrogen has been lost in this...
Most questions answered within 3 hours.
-
A regression equation that describes the relationship between
the amount of the bill ($) at a...
asked 1 minute ago -
284 mL of a 0.52 M potassium hydroxide solution is added to 467
mL of a...
asked 29 minutes ago -
exercise on VSEPR and molecular structrue.
octahedral
SeCl62-
TeCl62-
ClF62-
distorted
SeF62–
IF6–
asked 31 minutes ago -
Little’s Law: Val d’Costa is a world famous ski village in the
French Alps. Because of...
asked 1 hour ago -
Find the absolute error D for the calculation if A + B/C=D A=
9.4 +/- 0.4...
asked 1 hour ago -
New Air Heating and Cooling, manufactures furnaces and central
air units. The company pride itself on...
asked 1 hour ago -
A coach uses a new technique to train gymnasts. Seven
gymnasts were randomly selected and their...
asked 3 hours ago -
While rotating the tires on your car you notice a rock [mass =
0.1 Kg] stuck...
asked 5 hours ago -
Using MARS simulator, write MIPS programs according to
the following scenarios: Receive a positive integer number...
asked 7 hours ago -
An object in front of a concave mirror has a real image that is
11.5 cm...
asked 7 hours ago -
Consider the reaction, C3 H8 + O2 --> CO2 + H2O. How many
moles of O2...
asked 9 hours ago -
You and your opponent both roll a fair die. If you both roll the
same number,...
asked 9 hours ago