The Schwarzschild radius of a black hole is that radial distance from the center of a sphere within which not even light can escape
It was first discovered mathematically by Schwarzschild in 1916 after Einstein published his general relativity theory. It can be calculated from a star's mass M as: R = 2GM/c2. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be A)
the same.
B)
twice as much.
C)
half as much.
D)
four times as much.
E)
one-fourth as much.
E
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What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm
If the microscope is focused on a small object, what is the distance between the object and the objective lens? A) 0.73 cm B) 0.31 cm C) 0.57 cm D) 0.49 cm E) 0.42 cm
_____ says that the total mass of a star must equal the sum of the masses of its shells
A) The law of conservation of mass B) The law of mass action C) Fick's first law of mass transfer D) Newton's law of mass accumulation
What did the Greek philosopher Philolaus believe about the Universe? a. No parallax seen of new stars means Earth is the center of the Universe. b. Perfect heavens must be made of up spheres rotating at constant rates. c. The most perfect geometrical form was the sphere
d. The heavens are perfect and Earth is imperfect. e. Earth moved around a central fire.