A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The impedance is
a. 3.77 ?.
b. 9.26 ?.
c. 10.0 ?.
d. 10.7 ?.
e. 13.8 ?.
d
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Solar One, located near Barstow, CA, was the first large-scale (10 MW electric) solar- thermal electric-power-generating plant in the United States. A schematic diagram of the plant is shown below. The receiver may be treated as a cylinder 7 m in diameter and 13.5-m-tall. At the design operating conditions, the average outer surface temperature of the receiver is about 675°C and ambient air temperature is about 40°C. Estimate the rate of heat loss, in MW, from the receiver—via natural convection only—for the temperatures given. What are other mechanisms by which heat may be lost from the receiver?
GIVEN
• A vertical cylinder in air
• Height of cylinder (L) = 13.5 m
• Diameter (D) = 7 m
• Surface temperature (Ts) = 675°C
• Ambient air temperature (T?) = 40°C
FIND
(a) The rate of convective heat loss (qc) in MW
(b) What other mechanisms for heat loss exist?
ASSUMPTIONS
• Air is still
• Surface temperature is uniform and constant
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 357.5°C
Thermal expansion coefficient (?) = 0.00160 1/K
Thermal conductivity (k) = 0.0461 W/(m K)
Kinematic viscosity (?) = 58.1 × 10–6 m2/s
Prandtl number (Pr) = 0.72
White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye
a. True b. False Indicate whether the statement is true or false
The region of the electromagnetic spectrum with frequencies just greater than those in the ultraviolet region is the ______________ region
a. x-rays b. radio waves c. microwaves d. infrared e. gamma rays
A proton is moving perpendicular to a magnetic field at 
and experiences a magnetic force of magnitude
N. What is the magnitude of the magnetic field?
A. 0.52 T
B. 
C. 
D. 
E. 