The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800c?
A. 8.13
B. 2.75
C. 3.67
D. 15.8
E. 1.32
Answer: C
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What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. proton-proton chain b. CNO cycle c. triple alpha process d. white dwarfs don't generate their own energy.
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 5.0 B) 3.0 C) 4.0 D) 1.0 E) 2.0
A fluid is drawn up through a tube as shown in the figure. If the height difference from the top of the tank to the bottom of the siphon is H = 1.40 m, then what is the outflow speed? Assume the pressure is the same at the top of the tank and at the siphon outlet
?
a.
3.70 m/s
b.
27.4 m/s
c.
5.24 m/s
d.
6.86 m/s
Ozone in the Earth's upper atmosphere
A) filters incoming infrared light reaching Earth's surface. B) filters incoming visible light reaching Earth's surface. C) filters incoming ultraviolet radiation reaching Earth's surface. D) acts as a blanket to keep Earth's surface warm.