The equivalent capacitance of the circuit shown below is
a.
0.50 C.
b.
1.0 C.
c.
1.5 C.
d.
2.0 C.
e.
2.5 C.
b
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Solenoid: Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the radius of the solenoid is doubled to 2b, but all the other quantities remain the same, the magnetic field inside the solenoid will
A. remain the same. B. become twice as strong as initially. C. become one-half as strong as initially. D. become four times as strong as initially. E. become one-fourth as strong as initially.
If our eyes were sensitive only to X rays, the world would appear __________.
A. gray, black, and white like a medical X ray B. brighter than normal because X rays carry more energy than visible light photons C. dark because X-ray light does not reach Earth’s surface D. green, yellow, and orange, because those are the colors of X rays
A blood warmer is often used in certain clinical transfusion procedures. While safely storing and preserving blood requires refrigeration, cold blood when used in rapid transfusion procedures could cause clinically dangerous hypothermia in a patient. A new compact and miniature heat exchanger has been proposed that is used “inline” with the transfusion delivery system. It consists of a multi-tube bundle of 5-mm diameter tubes arranged in an equilateral-triangular array with tube centers 7.5 mm apart. Blood flows inside the tubes and is warmed by a heated airstream that is in external cross flow such that the tube surface is maintained at 40°C. The inlet air flow to the tube array is at 70°C with a free stream velocity of 2 m/s, and there are five lateral or transverse rows in the
bundle. Determine the average heat transfer coefficient and pressure drop in the airstream. Also, what is the change in both of these quantities if the tube center-to-center pitch is reduced to 6.0 mm? GIVEN Heated air flowing over an equilateral staggered tube bank Air temperatures Tair,in = 70°C Number of tube rows (N) = 5 Tube diameter (D) = 5 mm= 0.005 m Center to center pitch(S) = 7.5 mm=0.0075 m Free stream velocity (Ua) = 2 m/s Tube surface temperature (Tt) = 40°C FIND The average heat transfer coefficient ( h c) and pressure drop in airstream. Change in average heat transfer coefficient and pressure drop when center to center pitch is reduced to 6 mm. ASSUMPTIONS Steady state The correlation of Equation 6.38 can be applied to a pitch-to-diameter ratio of 1.5 Tube wall temperature is uniform and constant
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. C) Star 1 is 100 times more distant than Star 2. D) Star 1 is 100 times nearer than Star 2. E) Star 1 is 10 times more distant than Star 2.