The energy transfer between two objects.

Question

Two objects with different sizes, masses, and temperatures are placed in thermal contact. Choose the best answer: Energy travels (a) from the larger object to the smaller object (b) from the object with more mass to the one with less mass (c) from the object at higher temperature to the object at lower temperature.

Answer 1

Question

Chapter 10.1, Problem 10.1QQ

To determine

The energy transfer between two objects.

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Two objects with different sizes, masses, and temperatures are placed in thermal contact. Choose the best answer: Energy travels (a) from the larger object to the smaller object (b) from the object with more mass to the one with less mass (c) from the object at higher temperature to the object at lower temperature.

Two objects, with different sizes, masses, and temperatures, are placed in thermal contact. In which direction does the energy travel? (a) Energy travels from the larger object to the smaller object. (b) Energy travels from the object with more mass to the one with less mass. (c) Energy travels from the object at higher temperature to the object at lower temperature.

Assume that when in thermal equilibrium (i.e. the temperature is not changing) Mars absorbs all of the heat it receives from the Sun and then re-radiates it as black body radiation from all parts of its spherical surface. Assuming that Mars' temperature is uniform across all of its surface, calculate the temperature on Mars. The Stefan-Boltzmann constant σ=5.7×10−8 W m−2K−4.To answer this question you need to balance the total energy per second being absorbed by Mars with the total energy per second being radiated by Mars. Key: Flux of radiation from the Sun at Mars' orbital radius is 597 W m-2. The luminosity of the Sun Ls = 3.8×1026 W. Mars orbits at a distance of 2.25×1011 m (1.5 AU) from the Sun. Total amount of radiative energy per second is 2.2 x 1016 W.