An image of Mars taken with the Hubble Space Telescope shows a small Northern polar cap and a large Southern Polar cap. What season is it in the Northern hemisphere?
A) spring
B) fall
C) summer
D) winter
C
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Estimate the R-values for a 5 cm-thick fiberglass board and a 2.5 cm-thick polyurethane foam layer. Then compare their respective conductivity-times-density products if the density for fiberglass is 50 kg/m3 and the density of polyurethane is 30 kg/m3 . Use the units
GIVEN - 5 cm thick fiberglass board, density = 50 kg/m3 - 2.5 cm thick polyurethane, density = 30 kg/m3 FIND (a) R-values for both (b) Conductivity-times-density products for both ASSUMPTIONS (a) One-dimensional, steady conduction
Without the greenhouse effect operating in our atmosphere,
A) the ozone layer would not be weakening. B) the Earth would have become much more like Venus long ago. C) we would not have to worry about any warming problems in the future. D) Earth would have an average temperature of -23 degrees Celsius. E) the ice in the polar regions would have melted long ago.
Adaptive optics measures and cancels out all seeing distortions that are caused by turbulence in Earth's atmosphere
a. True b. False Indicate whether the statement is true or false
How long do sunspots typically last? Choose the best answer
a. an hour b. a day c. a week d. two weeks or a fortnight