Light reflects off the surface of Lake Superior. What phase shift does it undergo?
A) 0°
B) 90°
C) 180°
D) 270°
E) It does not undergo any phase shift.
C
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What are cosmic rays?
A) subatomic particles that travel close to the speed of light B) a form of light with shorter wavelength than gamma rays C) fast-moving dust particles in the interstellar medium D) any light waves from space
At last, someplace fairly comfortable. Very weak gravity is holding you to the surface of the small object on which you sit. Your object is apparently moving away from a star, perhaps one that it orbits with a period of thousands of years
Around you, geysers are spouting gas into space. Looking back along the object's orbit, you see particles of dust that the geysers apparently blew off the object when it was nearer to the star that it is now leaving behind. You conclude that the geysers were recently much more active but are now settling down into a quiescent state that may last for millennia. You also soon realize that you are closer to home than you have been in all your previous journeys. Perhaps if you can somehow find a small rocket, a heat shield, and a good parachute, you can escape and head home for your final exam. Where are you? A) You are on an asteroid near the center of a galaxy, heading in toward a massive black hole. B) You have been shrunk in size and are riding a grain of interstellar dust that is carrying you on an orbit about our very own Sun. C) You are riding a jet of gas from a quasar that is headed in the direction of an ordinary star. D) You are on comet Hale-Bopp, circa May 1997. E) You are at Disneyland on the Moon, riding the new "wild and wet" roller coaster.
In order to go from rest to 50 m/s in 10 s, a jet must be able to accelerate at
A. 20 m/s2. B. 2 m/s2. C. 5 m/s2. D. 50 m/s2.
A rod (length = 80 cm) with a rectangular cross section (1.5 mm × 2.0 mm) has a resistance of 0.20 ?. What is the resistivity of the material used to make the rod?
a. 6.0 × 10^?7 ? / m b. 3.8 × 10^?7 ? / m c. 7.5 × 10^?7 ? / m d. 3.0 × 10^?7 ? / m e. 4.8 × 10^?7 ? / m