A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the value of the resistor?
A)
100 ?
B)
184 ?
C)
552 ?
D)
579 ?
E)
200 ?
B
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Determine (a) the temperature at the 16 equally spaced points shown in the accompanying sketch to an accuracy of three significant figures and (b) the rate of heat flow per meter thickness. Assume two-dimensional heat flow and k = 1 W/(mK).
GIVEN
A two-dimensional object with specified surface temperatures
FIND
(a) The temperature at the 16 specified locations
(b) The heat flow per meter thickness
ASSUMPTIONS
Steady state
SKETCH
What is the celestial equator?
A) another name for the ecliptic B) the path the Sun appears to trace through the constellations each year C) a projection of Earth's equator into space D) the technical name of the Sun's equator
In a vacuum the speed of light waves compared to the speed of radio waves is
A. faster B. slower C. the same
David drinks a glass of water in his kitchen. The water is at room temperature, and David decides to make it colder by adding ice. Which of the following describes why the ice cubes will melt?
a. Liquid water is reacting with solid water to absorb energy b. Water is evaporating from the surface of the water. c. Slow-moving molecules move out of the ice. d. Heat from the water moves into the ice.