What method of extrasolar planet relies on the star getting brighter than usual and thenfainter again?
a) astrometry
b) radial velocity
c) direct imaging
d) microlensing
e) transits
Answer: d) microlensing
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The largest share of renewable energy in the U.S. comes from
a. wind b. natural gas c. hydro d. petroleum e. radiant solar
What is the ultimate fate of an isolated pulsar?
A) It will spin ever faster, becoming a millisecond pulsar. B) As gravity overwhelms the neutron degeneracy pressure, it will explode as a supernova. C) As gravity overwhelms the neutron degeneracy pressure, it will become a white dwarf. D) It will slow down, the magnetic field will weaken, and it will become invisible. E) The neutron degeneracy pressure will eventually overwhelm gravity and the pulsar will slowly evaporate.
Answer the following statement(s) true (T) or false (F)
1. The space time interval ?s between two events can never be larger than the coordinate time ?t between those events as measured in any inertial reference frame.
A 3.00-kg mass is placed at (2.00, 3.00) m, and a 4.50-kg mass is placed at (2.00, ?3.00) m. What is the moment of inertia of this system of masses about the y axis?
a. 97.5 kg·m2 b. 15.0 kg·m2 c. 67.5 kg·m2 d. 30.0 kg·m2 e. 22.5 kg·m2