When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts
B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths
C) visible and ultraviolet light from the companion star
D) bright x-ray emission that varies on a time scale of a few hours
A) intense x-ray bursts
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The temperature scale that places zero at the point where all atomic and molecular motion ceases is
A) Fahrenheit. B) Celsius. C) Kelvin. D) centigrade. E) Ransom.
A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes ?v0. The total time of travel is 2t. The total distance the body travels in that time is
A.
.B.
.C.
.D.
.E.
.The magnitude of the electric force between two protons is 2.30 × 10-26 N. How far apart are they?
1.0.100 m 2.0.0220 m 3.3.10 m 4.0.00570 m 5.0.480 m
The odds of a 100-meter asteroid hitting Earth over the course of one year is approximately __________.
Fill in the blank(s) with the appropriate word(s).