Approximately how many extrasolar planets have been discovered to date?
A) tens
B) hundreds
C) thousands
D) millions
E) billions
C) thousands
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The average power input to a series alternating current circuit is minimum when
a. there are only a resistor and capacitor in the circuit. b. there are only a resistor and inductor in the circuit. c. there is only a resistor in the circuit. d. XL = XC and the circuit contains a resistor, an inductor and a capacitor. e. there is only a capacitor in the circuit.
One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T b. 5.0 ?T c. 3.0 ?T d. 7.0 ?T e. 1.0 ?T
Flue gases at 700ºC pass over a bank of superheater tubes at 6 m/s. The tube bank is composed of 20 columns of 2 cm diameter tubes with 40 tubes per column. The arrangement of the tubes is staggered as shown in the figure with ST = SD = 4.0 cm. Determine the pressure drop across the tube bundles, assuming that the tubes have an average surface temperature of 500ºC.
Visual design is the first thing you need to determine when planning a website.
Answer the following statement true (T) or false (F)