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What is the temperature of a planet which has a radius of 7296 km and its dista…

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Wize University Physics Textbook (Master) > Heat and Temperature

Heat Transfer: Radiation

3 Activities


  1. What is the temperature of a planet which has a radius of 7296 km7296\ km and its distance to the Sun is 2.5 times the Earth to Sun distance. The solar constant of Earth is 1.367kwm21.367 \frac{kw}{m^2} and the Albedo factor of the unknown planet is 0.15.
  2. Suppose gases around this planet, reflect 80% of the already reflected lights from the surface of the planet back to it. How much can these gases change the temperature on the surface of this planet?
Question A
More Heat Transfer: Radiation Questions:
Liquid helium is stored at its boiling point, 4.2 K4.2\ K, in a spherical capsule that is separated by a vacuum space from a surrounding container that is maintained at the temperature of liquid nitrogen, 77 K77\ K. The capsule has a radius of 0.1 m0.1\ m and it is blackened on the outside.
a) Calculate the amount of helium that boils away in one day.
b) Now imagine the vacuum is replaced by a 20 cm20\ cm glass layer around the spherical capsule. How much helium boils away per day in this new condition?
If the solar constant from the sun is 1367 Wm21367\ \frac{W}{m^2} and the area of the solar panel is 2 m22\ m^2. Find the temperature of the solar panel. e=1.
A solar array powering a satellite is shown below. The array is connected to satellite by a thin aluminium rod. The array is facing the sun, and has a temperature of 1100 [K]1100\ \left[K\right], the satellite body has a temperature of15 K15\ K. Find the net heat transfer from the array to the satellite body.
The rod has a cross sectional area of 0.5 [m2]0.5\ \left[m^2\right].The square array and the satellite are facing one another and have 3 ×3 [m]3\ \times3\ \left[m\right]faces, they are 10 m10\ m apart.
kal=205 [WmK]k_{al}=205\ \left[\frac{W}{mK}\right]
A spherical object with a temperature of 45°C45\degree C. The object has a value of e=1 and a radius of 10 cm. What is the power outputted by the sphere.
New Practice Question
Liquid helium is stored at its boiling point, 4.2 K, in a spherical capsule that is separated by a vacuum space from a surrounding container that is maintained at the temperature of liquid nitrogen, 77K. The capsule has a radius of 0.1 m and it is blackened on the outside. Calculate the amount of helium that boils away in one day. Now imagine the vacuum is replaced by a 20cm glass layer around the spherical capsule. How much helium boils away per day in this new condition?
LHe=20.9×103 JKgL_{He}=20.9\times10^3\ \frac{J}{Kg}
(kglass=1.05 wm⋅K)\left(k_{glass}=1.05\ \frac{w}{m\cdot K}\right)