When U-235 undergoes fission, the total number of protons in the fragments is
A) 90.
B) 91.
C) 92.
D) 93.
E) none of the above
Answer: C
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TE is much smaller for lead than for iron. Which therefore has the greater heat capacity per atom at T = 100 K?
A. Lead B. Iron C. Both should be about the same.
All of the following hypothetical planets orbit a star with the same mass as the Sun (one solar mass)
Which one has the shortest orbital period? (If two objects would have the same orbital period to within a difference of less than 1% consider them as having identical periods.) A) Planet A: one Earth mass and 1 AU from the star B) Planet B: two Earth masses and 1 AU from the star C) Planet C: two Earth masses and 2 AU from the star D) Planets A and B E) Planets B and C F) All of them have the same period.
Two spaceships approaching each other move at very close to the speed of light, each sending a beam of light to the other. Each measures the speed of light from the other spaceship as
A) slightly less than c. B) c. C) slightly greater than c. D) much greater than c.
A charge Q is uniformly distributed throughout a nonconducting sphere of radius R
(a) What is the magnitude of the electric field at a distance R/2 from the center of the sphere? (b) What is the magnitude of the electric field at a distance 2R from the center of the sphere?