During an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much energy via heating is added to the gas during this process?
A) 0 J
B) 50 J
C) -50 J
D) 25 J
E) -25 J
C
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Two long concentric horizontal aluminum tubes of 0.2 m and 0.25 m diameter are maintained at 300 K and 400 K respectively. The space between the tubes is filled with nitrogen. If the surfaces of the tubes are polished to prevent radiation, estimate the rate of heat transfer for gas pressure of (a) 1 MPa and (b) 10 kPa in the annulus.
? Two concentric horizontal aluminum tubes with nitrogen between them
? Diameters ? Di = 0.2 m
? Do = 0.25 m
? Temperatures ? Ti = 300 K
? To = 400 K
? Surface of tubes is polished
FIND
The rate of heat transfer for
(a) Pressure (pa) = 1 MPa
(b) Pressure (pb) = 10 kPa
ASSUMPTIONS
? Steady state conditions
? Radiative heat transfer is negligible
? Only the density of the nitrogen is affected by the pressure
PROPERTIES AND CONSTANTS
From Appendix 2, Table 33, for Nitrogen at one atmosphere and the mean temperature of 350 K
Correcting the density for Pressure
An electron is moving at 
m/s perpendicular to a uniform magnetic field. If the radius of the motion is 18 mm, what is the magnitude of the magnetic field?
A. 70 mT
B. 0.95 mT
C. 9.3 mT
D. 1.6 
T
E. 8.9 nT
If Earth rotated more slowly about its axis, your weight would
A) increase. B) decrease. C) stay the same. D) be zero.
If a bullet is fired into a solid wooden block and comes out the other side, the collision was ________ inelastic.
What will be an ideal response?