If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air.
b. as a concave lens in air.
c. as a convex lens in air.
d. as a flat refracting surface between water and air as seen from the water side.
e. as the glasses worn by a farsighted person.
b
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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).
A batter hits a home run in which the ball travels 110 m horizontally with no appreciable effects of air. If the ball left the bat at 50° above the horizontal just above ground level, how fast was it hit?
What will be an ideal response?
A steel pipe column (E 5 210 GPa) with length L 5 4.25 m is constructed of circular tubing with outside diameter d2 5 90 mm and inner diameter d1 5 64 mm. The pipe column is fixed at the base and pinned at the top and may buckle in any direction. The Euler buckling load of the column is most nearly:
(A) 303 kN
(B) 560 kN
(C) 690 kN
(D) 720 kN
Water began condensing around 1 A.U. from the Sun, which is why Earth has so much water and Venus has almost none
Indicate whether the statement is true or false