A Boeing 737 airliner has a mass of 20 000 kg and the total area of both wings (top or bottom) is 100 m2 . What is the pressure difference between the top and bottom surface of each wing when the airplane is in flight at a constant altitude?
a. 1 960 N/m2
b. 3 920 N/m2
c. 7 840 N/m2
d. 4 560 N/m2
e. 3 070 N/m2
A
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Driscoll et al.(365) write that: "Without strong acid anions, cation leaching in forest soils of the Northeast is driven largely by naturally occurring organic acids derived from the decomposition of organic matter, which takes place primarily in
the forest floor. ... [O]rganic acids tend to mobilize Al through formation of organic–Al complexes, most of which are deposited lower in the soil profile ... This process ... results in surface waters with low concentrations of Al. ... Acidic deposition to forest soils with base saturation values less than 20% increases Al mobilization and shifts chemical speciation of Al from organic to inorganic forms that are toxic to terrestrial and aquatic biota." Exactly what are they saying? Explain.
It is often possible to use atomic masses when calculating the binding energy of a nucleus. This is not true for calculating the Q value for the e+ decay process since
a. the electron masses do not cancel. b. a positron is an antiparticle. c. the electron masses cancel. d. the mass of a positron cannot be neglected when compared to the mass of a nucleus. e. none of the above.
Physicists today consider the Bohr model of the atom to be
A) an accurate picture of a hydrogen atom. B) totally useless — of historical interest only. C) oversimplified, but nevertheless useful.
To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s
How high is the pole above the point where the ball was launched? (You can ignore air resistance.) A) 10 m B) 13 m C) 16 m D) 18 m E) 26 m