Why does Mars have more extreme seasons than Earth?
A) because it is farther from the Sun
B) because it has a larger axis tilt
C) because it has a more elliptical orbit
D) because it has more carbon dioxide in its atmosphere
C) because it has a more elliptical orbit
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Determine the overall thermal resistance per unit area for the wall shown in Figure 2-51. Exclude the thermal resistance due to convection heat transfer in the analysis. Then, if the heat transfer is expected to be 190W/m^2 and the exposed brick surface is 10ºC, estimate the temperature distribution through the wall.
You are moving at 120 km/h toward a stationary train. The train blows its 0.400-kHz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?
A) 361 Hz B) 444 Hz C) 364 Hz D) 439 Hz
Estimation: Estimate the number of times the earth will rotate on its axis during a human's lifetime.
A. 3 × 104 B. 3 × 105 C. 3 × 106 D. 3 × 107 E. 3 × 108
Compare the graph above to Figure 8.14, which shows the decay of potassium-40. Which element is more radioactive (undergoes radioactive decay more quickly)?
A) uranium-235 B) potassium-40 C) Both are equally radioactive.