Which light source is more energy-efficient?
A) a fluorescent lamp
B) an incandescent lamp
C) a CFL
D) an LED
Answer: D
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A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the magnitude of the net force on the ball?
A) 0 N B) 20 N C) 40 N D) 50 N E) 100 N
When frozen water on the surface of Mars heats up during summer time, the water
a. melts and forms liquid pools on the surface. b. boils off the surface and escapes into outer space. c. sublimates and goes directly into the gaseous phase. d. remains frozen because the temperature remains below the freezing point. e. melts and creates flowing rivers that erode the landscape.
The apparent "surface" of Jupiter is actually the tops of ________
Fill in the blank(s) with correct word
A parallel light beam containing two wavelengths, 480. nm and 700. nm, strikes a plain piece of glass at an angle of incidence of 60°. The index of refraction of the glass is 1.4830 at 480. nm and 1.4760 at 700. nm
Determine the angle between the two beams in the glass.