Which two properties are most important in determining the surface temperature of a planet?
A) composition and distance from the Sun
B) size and chemical composition
C) size and atmosphere
D) internal temperature and atmosphere
E) distance from the Sun and atmosphere
E
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Polyurethanes result from the reaction of a(n) _________and an isocyanate.
Fill in the blank(s) with the appropriate word(s).
A refrigerator uses 40.0 J of work to extract 90.0 J from a heat reservoir at 
What is the coefficient of performance for the refrigerator?
A. 1.60 B. 2.05 C. 2.25 D. 2.85
Suppose Earth collapsed down to one-tenth of its present radius, while retaining all of its present mass. Compared to your present mass, your mass would be
A) reduced by a factor of 100. B) unchanged. C) reduced by a factor of 10. D) increased by a factor of 10. E) increased by a factor of 100.
Green light has a wavelength of 5.4 × 10^?7 m. What is the frequency of this EM-wave in air?
a. 5.56 × 10^14 Hz b. 6.00 × 10^11 Hz c. 9.00 × 10^8 Hz d. 3.00 × 10^10 MHz e. 1.80 × 10^15 Hz