Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water
B) slightly cooler, but still above freezing
C) slightly warmer, but still well below the boiling point of water
D) about the same as it is now
A
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A Venturi tube may be used as the inlet to an automobile carburetor. If the inlet pipe of 2.00 cm diameter narrows to 1.00 cm diameter, what is the pressure drop in the constricted section for airflow of 2.16 m/s in the 2.00-cm section? (Assume air density is 1.25 kg/m3.)
a. 11.7 Pa b. 43.7 Pa c. 45.7 Pa d. 20.3 Pa e. 87.5 Pa
Which of these was NOT true about the limitations of Bohr's model?
a. The Bohr model failed to explain why electrons do not radiate. b. The Bohr model could not predict spectral lines for elements which have more than one electron in the outer shell. c. The Bohr model could not account for splitting of spectral lines. d. The Bohr model could not account for the basic periodic nature of the elements. e. The Bohr model could not explain why each shell held the number of electrons that it did.
Why do we have seasons on Earth?
a) Season are caused the Sun moving through the constellations of the zodiac b) the spin axis of the Earth titled 23.5 with respect to a line normal to the plane of orbit c) the earth's distance from the Sun varies, so that it is summer the we are closer to the Sun and winter when we are farther from the Sun The spin axis of the Earth is titled 23.5 with respect to a line normal to the plane of orbit
In the proton-proton cycle, two positrons are produced. What more familiar particles are they similar to, and how do they differ?
What will be an ideal response?