The singularity of a black hole
a. is found outside the event horizon.
b. is located within the event horizon.
c. can only be located if the black hole is in a binary system.
d. doesn't exist since all black holes have a finite size.
B
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Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear
A) brighter. B) redder. C) larger. D) bluer. E) to have a higher radial velocity.
A creature that is scaled up in size, keeping its proportions,
A) will be stronger relative to its greater weight. B) will be weaker relative to its greater weight. C) both of these D) neither of these
A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path. In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm
What was the potential difference V? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C)
Special relativity tells us that
A) the speed of light is variable. B) light moves faster if emitted by a source moving in the direction of emission. C) light moves faster if emitted by a source moving in the direction of emission and light moves slower if emitted by a source moving in the direction opposite the emission. D) light moves slower if emitted by a source moving in the direction opposite the emission. E) light moves at the same speed independent of the motion of the source.