Estimate the total thermal energy of the Sun from the fact that its internal temperature is of order 107 K. Show that this is of the same order as the rough estimate of gravitational potential energy.
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- How much heat does it take to vaporize 800 g of liquid nitrogen (N 2)?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 surface of the Sun has a temperature of about 5,800 K. The radius of the Sun is 6.96 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity of the Sun is 0.986. _____________W
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