The approximate main-sequence lifetime of a star of spectral type O is ________
A) 300 million years B) 10 billion years C) 10,000 years D) 3 million years
D
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At what frequency does a 10. ?F capacitor have a reactance of 0.12 k??
What will be an ideal response?
Uniform Circular Motion: A particularly scary roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is 13.2 m, with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.
A. 11.4 m/s B. 12.5 m/s C. 10.1 m/s D. 14.9 m/s
When uranium emits a beta particle, the result is
A) a uranium ion. B) a different isotope of uranium. C) the first transuranic element. D) all of the above E) none of the above
Wine made from fossil fuels is not radioactive because
A. the radioactivity has decayed away B. there is no carbon in such wine C. ancient plants never were radioactive D. the half-life of the key elements is too long