What is the root-mean-square speed of chlorine gas molecules at a temperature of 346 K? (R = 8.31 J/mol/K, NA = 6.02 × 10^23, and the molecular mass of Cl2 = 71)
a. 1.1E+2 m/s
b. 3.5E+2 m/s
c. 8.2E+4 m/s
d. 1.2E+5 m/s
e. 3.5E+4 m/s
b
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The cosmic background radiation appears compatible with a blackbody source at what temperature?
a. 0.0003 K c. 300 K b. 3 K d. 0.03 K
Coulomb's Law: Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron would the proton have to be? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg, melectron = 9.11 × 10-31 kg)
A. 1.5 m B. 2.3 m C. 3.7 m D. 4.6 m E. 5.1 m
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge.)
Pressure is measured in a 1.1 cm radius water hose at a height of 1.5 m above the floor of a house and compared to that in a hose connected to the first (of radius 2.2 cm). If the pressure in the larger radius hose is the same as that in the smaller radius hose, how far above the floor is the location for this pressure measurement?
A. 0.23 N B. 8.1 N C. 0.81 N D. 2.3 N