What is the average power dissipation in an RLC series circuit with R = 10?, L = 0.1 H, C = 10 ?F when driven at resonance by a 100 V-rms source?
a. 100 W
b. 500 W
c. 1000 W
d. 2 kW
e. 700 W
c
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Indicate whether the statement is true or false
A common opinion concerning the creationism versus evolution controversy is the idea that Earth was created fairly recently but that it was created with fossils and other evidence of great age already present, so that Earth has the appearance of
being very old even though it is really quite young. This opinion is best classified as A) a scientific hypothesis for which there is currently insufficient evidence. B) a scientific opinion that is probably incorrect. C) nonscientific because it contradicts common sense. D) nonscientific because there is no conceivable scientific way to disprove it. E) a scientific opinion that is certainly incorrect.
Suppose the ends of a 20-m long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 15 cm2 . What force does the beam exert when it is heated to 40°C? (asteel = 1.1 × 10^-5/C°, Ysteel = 2.0 × 10^11 N/m2)
a. 2.6 × 10^5 N c. 1.3 × 10^5 N b. 5.6 × 10^4 N d. 6.5 × 10^2 N
Why is it surprising that spiral arms are stable structures, lasting billions of years? a. Differential rotation should tear the arms apart
b. Gas and dust clouds should run out of material to make young stars. c. Supernova explosions should disrupt the arms. d. Globular clusters are continuously passing through the arms. e. Gravity should pull the arms down into the center of the galaxy.