A quasar's spectrum is hugely redshifted. What does this large redshift tells us about the quasar?
A) the composition of the quasar
B) the size of the quasar's central, supermassive black hole
C) the distance to the quasar
D) the type of host galaxy in which the quasar resides
C
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Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
a. 1.1 N/C b. 4.5 N/C c. 1.4 N/C d. 5.6 N/C e. 0.50 N/C
In Heisenberg's formula, ?p ?x? h, the ? symbolizes
A) increase in. B) decrease in. C) change in. D) uncertainty of. E) certainty of.
The Hubble Space Telescope
a. has a flawed primary mirror b. has been repaired c. has failed d. none of the above
A solution with a boiling point of 82°C boils on the outside of a 2.5 cm tube with a No. 14 BWG gauge wall. On the inside of the tube flows saturated steam at 40 kPa(abs). The convection heat transfer coefficients are 8.5 kW/(m2 K) on the steam side and 6.2 kW/(m2 K) on the exterior surface. Calculate the increase in the rate of heat transfer if a copper tube is used instead of a steel tube
GIVEN
• Tube with saturated steam on the inside and solution boiling at 82°C outside
• Tube specification: 1 in. No. 14 BWG gauge wall
• Saturated steam in the pipe is at 40 kPa(abs)
• Convective heat transfer coefficients
? Steam side ( ci h ) : 8.5 kW/(m2 K)
? Exterior surface ( co h ) : 6.2 kW/(m2 K)
FIND
• The increase in the rate of heat transfer for a copper over a steel tube
ASSUMPTIONS
• The system is in steady state
• Constant thermal conductivities
SKETCH
