Venus has many more _______________ than Earth, but not nearly as many as Earth's Moon
Fill in the blank(s) with correct word
craters
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The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1-m-wide and 1-m-tall. The fins are to be rectangular in cross section, 2.5-cm-long and 0.25-cm-thick. There are to be 100 fins per meter. The convective heat transfer coefficient, both for the wall and the fins, is estimated at 35 W/(m2 K). With this information, determine the per cent increase in the rate of heat transfer of the finned wall compared to the bare wall.
GIVEN
Aluminum fins with a rectangular cross section
Dimensions: 2.5-cm-long and 0.25-mm-thick
Number of fins per meter = 100
FIND
The per cent increase in the rate of heat transfer of the finned wall compared to the bare wall
ASSUMPTIONS
Steady state heat transfer
SKETCH
Life will most likely be able to appear and evolve on a planet around which stage of a star's life?
A) core hydrogen-fusion B) shell helium-fusion C) core helium-fusion D) shell hydrogen-fusion
In a reconstruction of Earth's geologic past, the continents of Africa and South America fit best along the
A) shorelines. B) continental shelves. C) continental slopes. D) ocean floors.
Old stars are poor in heavy elements because there were very few previous generations of stars before the old stars formed
a. True b. False Indicate whether the statement is true or false