A thin layer of oil (n = 1.25 ) is on top of a puddle of water (n = 1.33 ). If normally incident 500-nm light is strongly reflected, what is the minimum nonzero thickness of the oil layer?
A) 250 nm B) 100 nm C) 400 nm D) 200 nm E) 150 nm
D
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A series LR circuit contains an emf source of 14V having no internal resistance, a resistor, a 34 H inductor having no appreciable resistance, and a switch
If the emf across the inductor is 80% of its maximum value 4.0 s after the switch is closed, what is the resistance of the resistor? A) 14 ? B) 1.9 ? C) 1.5 ? D) 5.0 ?
Any main-sequence star over 25 solar masses will probably retain enough matter in its core after its supernova to make a black hole
Indicate whether the statement is true or false
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 3.0 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, down. e. 12.8 m/s, down.
What percentage of the solar nebula's mass consisted of rocky material?
A) 0 percent B) 0.4 percent C) 2 percent D) 20 percent E) 80 percent