The Sun is a nonluminous ball of hot gas
Indicate whether the statement is true or false
False
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General Relativity: Suppose a 70-kg student were to be compressed to form a black hole. What would be the Schwarzschild radius of this black hole? (G = 6.67 × 10-11 N ? m2/kg2, c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
How long does it take the Earth to complete one orbit around the Sun?
A) one year B) one day C) one month D) one week E) The time it takes Earth to orbit the Sun changes significantly from one orbit to the next.
A double convex lens has faces of radii 18.0 cm and 20.0 cm. When an object is placed 24.0 cm from the lens, a real image is formed 32.0 cm from the lens. Determine:
(a) the focal length of the lens. (b) the index of refraction of the lens material.
The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm, respectively. An object is placed 3.00 mm from the objective
The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. What is the distance between the objective and the eyepiece? A) 9.9 cm B) 9.0 cm C) 15 cm D) 11 cm E) 13 cm