Star clusters are important to our study of the lives of high-mass versus low-mass stars because
a. stars in each cluster all formed at about the same time all with the same mass.
b. the Sun was once a member of a globular cluster.
c. stars in each cluster all formed at about the same time but with differing masses.
d. stars in each cluster all formed at different times with differing masses.
e. All of the other choices are correct.
c
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A single slit of width a is illuminated by light of wavelength ?. If a = 4.3?, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
A. 2. B. 4. C. 6. D. 8. E. 9.
Suppose two neutron stars or two black holes are closely orbiting one another. What do scientists predict will eventually happen to them, and why?
A) Their orbits will spiral inward until the two objects merge because of energy lost through gravitational waves. B) Their orbits will gradually grow larger because of the centrifugal force involved as they circle around each other. C) Their orbits will spiral inward as a result of friction with the surrounding gas until all the gas clears, after which their orbits will remain stable. D) The orbits would remain stable unless there were a third object orbiting along with them.
Current: If a quantity you calculated has units of A ? s, what is that quantity?
A. potential B. resistivity C. resistance D. capacitance E. charge
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of two.