The Schwarzchild 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 Schwarzchild in 1916 after Einstein published his general relativity theory
It can be calculated from a star's mass M as: R = 2GM/c2. If the mass of star G is twice as much as the mass of star H, the average density of star G compared to star H will be A) twice as much.
B) half as much.
C) four times as much.
D) one-fourth as much.
E) eight times as much.
D
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A stable group of stars that formed and are held together by their combined gravity is called a stellar association
Indicate whether the statement is true or false
How did the geocentric model and the heliocentric model of the universe explain retrograde motion?
What will be an ideal response?
Vision Problems: Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A. +36.4 cm B. -36.4 cm C. -21.2 cm D. +21.2 cm E. +32.5 cm
When running and jumping to score, a basketball player seems to "hang" in the air because
a. his or her acceleration is zero. b. his or her horizontal velocity is quite small. c. both components of motion are zero. d. his or her vertical velocity is quite small. e. levitation is possible with practice.