Spherical Mirrors: An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror. The image will appear
A. in front of the mirror.
B. inverted and reduced.
C. inverted and enlarged.
D. upright and reduced.
E. upright and enlarged.
Answer: D
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A 2.0-?F capacitor and a 4.0-?F capacitor are connected in series across an 8.0-V potential source. What is the charge on the 2.0-?F capacitor?
A) 2.0 ?C B) 11 ?C C) 4.0 ?C D) 25 ?C E) 12 ?C
A planetary nebula is the disk of matter around a star that will eventually form a planetary system.
Indicate whether the statement is true or false
What does it mean for something to be "quantized?"
a. It can have only certain discrete values. b. It can have only integer values. c. It can have values only between certain limits. d. none of the above
Replot the data points of Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line. Compare your results with Figure 5.10. Then, suppose that steam at 1 atm and 100°C is flowing across a 5-cm-OD pipe at a velocity of 1 m/s. Using the data in Figure 5.10, estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C and compare with predictions from your correlation equation.
GIVEN
Figure 5.9(b) in text
Steam flowing across a pipe
Steam pressure = 1 atm
Steam temperature (Ts) = 100°C
Pipe outside diameter (D) = 5 cm = 0.05 m
Steam velocity (U?) = 1 m/s
Pipe temperature (Tp) = 200°C
FIND
(a) Replot Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line
(b) Find the Nusselt number (Nu), the heat transfer coefficient (hc), and the rate of heat transfer per
unit length (q/L) using Figure 5.10
(c) Compare results with your correlated equation
ASSUMPTIONS
Steady state
Radiative heat transfer is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 35, for steam at 1 atm and 100°C
