The principal greenhouse gases in our present atmosphere are:
A) hydrogen and helium.
B) hydrogen sulfide and carbon disulfide.
C) water vapor and carbon dioxide.
D) methane and ammonia.
E) sulfuric acid vapor and carbon dioxide.
C
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The contact angle for a water droplet on wax is 112°. Assume that the surface tension for wax 0.023 N/m. What is the value of the interfacial tension between water and wax at 25°C?
What will be an ideal response?
The formula mass of water, H2O, is
a. 18 u. b. 9 u. c. 10 u. d. 17 u.
Why couldn't Newton determine the value of the gravitational constant?
a. The constant was too large to measure with existing instruments. b. The constant was too small to measure with existing instruments. c. If the gravitational constant were known, the mass of Earth could be calculated. d. Although Newton believed there was a constant, no one has ever discovered one. e. Although the right equipment and techniques for this measurement existed, Newton did not have access to them.
The energy of an ultraviolet photon is ________ a photon in the visible part of the spectrum.
A. shorter than B. longer than C. higher than D. lower than E. faster than