What is the current flowing through the 2-? resistor?
a.
2 A
b.
3 A
c.
4 A
d.
6 A
c
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A circular window 30 cm in diameter in a submarine can withstand a net maximum force of 5.20 × 105 N without damage
What is the maximum depth in a fresh-water lake to which the submarine can go without damaging the window? The density of fresh water is 1000 kg/m3. A) 680 m B) 740 m C) 1200 m D) 750 m
The image of an object beneath the surface of a medium of refractive index n > 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
a. real and closer to the viewer than the object. b. virtual and closer to the viewer than the object. c. real and farther from the viewer than the object. d. virtual and farther from the viewer than the object. e. virtual and the same distance from the viewer as the object.
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361 b. 636 c. 393 d. 396 e. 383
A photon whose wavelength is = 5.0 × 10^-11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^-11 m b. 4.5 × 10^-11 m c. 5.5 × 10^-11 m d. 6.0 × 10^-11 m e. 6.5 × 10^-11 m