Martian volcanoes are _______________ volcanoes with gradual slopes
Fill in the blank(s) with correct word
shield
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A square silicone chip 7 mm by 7 mm in size and 0.5 mm thick is mounted on a plastic substrate as shown in the sketch below. The top surface of the chip is cooled by a synthetic liquid flowing over it. Electronic circuits on the bottom of the chip generate heat at a rate of 5 watts that must be transferred through the chip. Estimate the steady state temperature difference between the front and back surfaces of the chip. The thermal conductivity of silicone is 150 W/(m K).
GIVEN
A 0.007 m by 0.007 m silicone chip
Thickness of the chip (L) = 0.5 mm = 0.0005 m
Heat generated at the back of the chip (Gq) = 5 W
The thermal conductivity of silicon (k) = 150 W/(m K)
FIND
The steady state temperature difference (?T)
ASSUMPTIONS
One dimensional conduction (edge effects are negligible)
The thermal conductivity is constant
The heat lost through the plastic substrate is negligible
SKETCH
Which of the following paraphrases Hubble Law?
A) The faster the galaxy spins, the more massive and luminous it is. B) The greater the distance to a galaxy, the greater its redshift. C) The greater the distance to a galaxy, the fainter it is. D) The more distant a galaxy is, the younger it appears. E) The older the galaxy appears to us, the more luminous it is.
A heat engine operating at maximum efficiency has an efficiency of 25%. The temperature of the cold reservoir is 300 K. What is the temperature of the hot reservoir?
A) 350 K B) 375 K C) 400 K D) 450 K E) 500 K
The atmosphere of Saturn is composed mostly of:
A) methane and ammonia. B) carbon dioxide and ethane. C) hydrogen and helium. D) hydrogen sulfide and ammonia. E) nitrogen and oxygen.