Deltas form as
A) periodic flooding clogs stream channels.
B) erosion clogs stream channels.
C) stream gradient decreases.
D) streams enter a standing body of water.
Answer: D
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Determine the amount of energy carried in 2.0 m of a 4.6-mW He-Ne laser beam if the cross-sectional area of the beam is 4.1 × 10^?6 m2
a. 1.4E–10 J b. 4.9E–12 J c. 3.1E–11 J d. 6.1E–8 J e. 1.0E–11 J
You obtain a 100. W lightbulb and a 50. W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct?
A) Both bulbs glow at the same increased brightness. B) The 100-W bulb glows brighter than the 50-W bulb. C) Both bulbs glow at the same reduced brightness. D) The 50-W bulb glows more brightly than the 100-W bulb.
Whenever the net force on an object is zero, its acceleration
A) may be zero. B) is zero. C) and velocity are the same. D) none of the above
2.0 L of a ideal nitrogen gas (N2 ) are at 0.00°C and 1.0 atm. The ideal gas constant is R = 8.314 J/mol • K = 0.0821 L ? atm/mol ? K, Avogadro's number is 6.022 × 1023 molecules/mol, and the ATOMIC mass of nitrogen is 14 g/mol
(a) Determine the number of moles of N2. (b) How many molecules of N2 are present? (c) What is the mass of this gas?