The planet Earth loses heat primarily by
A) conduction.
B) convection.
C) radiation.
D) all of the above
E) none of the above
Answer: C
Physics & Space Science
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Fred swings around a 0.40 kg ball attached to a string at constant speed in an almost horizontal circle of radius 1.3 meters. If one revolution takes 1.4 s:
(a) What is the angular speed of the ball? (b) What centripetal force is exerted on the ball?
Physics & Space Science
Which of the following stick structures could describe pentane (C5H12)?
A) a B) b C) c D) d E) none of the above
Physics & Space Science
Impedance: What resistance must be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40,000 ??
A. 45 k? B. 40 k? C. 37 k? D. 26 k?
Physics & Space Science
What is created by the fusion of three helium nuclei?
B) oxygen C) carbon D) nitrogen E) iron
Physics & Space Science