The meson having which of the following quark contents has electric charge -e?
a. 
b. 
c. 
d. 
e. 
a.
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Estimate the mass diffusivity of methane into air at 300 K, assuming ideal gas behavior.
What will be an ideal response?
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
An electron is released from rest at a distance of 9.00 cm from a proton
If the proton is held in place, how fast will the electron be moving when it is 3.00 cm from the proton? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 75.0 m/s B) 106 m/s C) 130 m/s D) 1.06 × 103 m/s E) 4.64 × 105 m/s
This photograph shows a hurricane from space. Why does it have the clockwise swirl?
A) because of the Coriolis effect B) because it is a strong hurricane C) because it is in the Northern Hemisphere D) because of the greenhouse effect