Estimate the mass diffusivity of methane into air at 300 K, assuming ideal gas behavior.
What will be an ideal response?
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An aluminum bar of diameter d 5 52 mm is twisted by torques T1 at the ends. The allowable shear stress is 65 MPa. The maximum permissible torque T1 is approximately:
(A) 1450 N?m
(B) 1675 N?m
(C) 1710 N?m
(D) 1800 N?m
The most recent estimates are that genetics contribute approx. ____________ to the development of personality characteristics such as shyness or activity level. *
Fill in the blank(s) with the appropriate word(s).
Casually sneaking a quick peek at a photo in your mobile phone
A) adds energy to the photo. B) subtracts energy from the photo. C) brings you into an observer-observed relationship that intrigues some science types. D) changes the phone itself E) none of the above
When U.S. annual energy use and gross national product (GNP) are graphed, the two graphs rise at the same rate until the mid-east oil shocks of the 1970s, after which
A) GNP keeps rising while energy use levels off due to global warming. B) GNP keeps rising while energy use begins to level off due to increased energy efficiency. C) energy use decreases due to declining fossil fuel supplies. D) GNP levels off while energy use keeps rising due to technological stagnation. E) total energy use increases without a similar increase in GNP, because of increased oil imports.