Approximately how many extrasolar planets have been discovered to date?

A) tens
B) hundreds
C) thousands
D) millions
E) billions


C) thousands

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science

Visual design is the first thing you need to determine when planning a website.

Answer the following statement true (T) or false (F)

Physics & Space Science