A 5-mol ideal gas system undergoes an adiabatic free expansion (a rapid expansion into a vacuum), going from an initial volume of 10 L to a final volume of 20 L. How much work is done on the system during this adiabatic free expansion?
a. -50 J
c. zero
b. -10 J
d. +50 J
C
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A brass rod is placed between two temperature sources so that heat can flow between them. One temperature is 80
and the other temperature is 20
The length of the rod is 50.0 cm and the cross sectional area is 15.0 cm2 . If the coefficient of thermal conduction for brass is 100 W/m 
then what is the heat flow between the hot temperature and the cold temperature?
A. 7.5 W B. 8.2 W C. 9.4 W D. 12 W E. 18 W
When a standing wave occurs on a string,
1.all points along the string move up and down equal distances. 2.all points along the string move up and down, but some move more than others. 3.many points along the string move up and down, some move more than others, and some are stationary. 4.all points along the string are completely stationary because the waves from each direction cancel each other out.
Why is it difficult to use the method of standard candles to find the distance to galaxies?
A. There are no known standard candles outside of our galaxy. B. Standard candles are too bright to be used for all but the farthest galaxies. C. It is difficult to isolate the light of a single star from the galaxy. D. All of these choices are correct.
Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis
a. 7.9 N/C b. 9.0 N/C c. 5.9 N/C d. 6.8 N/C e. 18 N/C