Consider the radiation heat transfer from an open fireplace that has a fire in it, as shown in the figure. The effective surface temperature of the fire is 600ºF and the fire has an effective emissivity of 0.95. The surroundings act as a black body at 60ºF. Determine the net heat transfer to a person sitting in front of the fireplace and the equilibrium surface temperature facing the fireplace. Neglect radiation from the back side and assume a shape factor of 0.15 for the opening of the fireplace to the person.
The equivalent circuit for heat transfer from the fireplace to the sitting person is
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Some young star clusters contain large numbers of protostars
a. True b. False Indicate whether the statement is true or false
Why do we think the first generation of stars would be different from stars born today?
A) Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse. B) Without heavy elements, the nuclear reactions at the center of the stars would be very different. C) Without heavy elements, there was no dust in the clouds and they collapsed faster. D) The Universe was much denser when the first stars were born. E) There were no galaxies when the first stars were born.
In what direction does a comet's tail point?
A. along the comet's orbit in the direction the comet is moving B. toward the Sun, pulled by its gravity C. away from the Sun D. perpendicular to the comet's orbit E. trailing the comet in its orbit
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The power you supply to the crate is __________
Fill in the blank(s) with correct word