According to general relativity, what is a black hole?
A) an object that cannot be seen
B) a place where light travels slower than the normal speed of light
C) a place where the strength of gravity is infinite
D) a hole in the observable universe
D
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A star's absolute visual magnitude depends on its _______________ and _______________
Fill in the blank(s) with correct word
A particle is confined to a one-dimensional box (an infinite well) on the x-axis between x = 0 and x = L. The potential height of the walls of the box is infinite
The normalized wave function of the particle, which is in the ground state, is given by ?(x) = sin , with 0 ? x ? L. What is the probability of finding the particle between x = 0 and x = L/3? A) 0.20 B) 0.22 C) 0.24 D) 0.26 E) 0.28
How do the densities of the jovian and terrestrial planets compare?
A) Made from the same solar nebula, they are all similar. B) More massive jovians all have high densities, compared to the tiny terrestrials. C) All terrestrials are more dense than any of the jovians. D) The closer a planet lies to the Sun, the less its density. E) No real pattern here; densities vary greatly and are very individual to each world.
A 10.0-kg picture is held in place by two wires, one hanging at 50.0° to the left of the vertical and the other at 45.0° to the right of the vertical. What is the tension in the first wire?
A) 69.6 N B) 50.8 N C) 98.1 N D) 69.4 N E) 23.8 N