A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m, and its amplitude is 8.4 mm
How much time does it take for a crest of the transverse wave to travel the length of the wire? A) 36 ms
B) 31 ms
C) 40 ms
D) 44 ms
E) 49 ms
A
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Cluster ages can be determined from
A) main sequence fitting. B) main sequence turnoff. C) pulsating variable stars. D) spectroscopic binaries. E) visual binaries.
A helium neon laser generates light of 632.8-nm wavelength. What color is that?
a. blue b. yellow c. red d. green
The predominant gas in the atmosphere of Earth is
A) oxygen. B) nitrogen. C) water vapor. D) carbon dioxide. E) methane.
: In an effort to increase the miles per gallon in automobiles many steel parts are being replaced with polymer parts where the strength of steel is not required.
The blades of the fan that cool the radiator experience a centripetal stress of less than 1×105 Pa when the fan blade material density is reduced to approximately 1×103 kg/m3. Vibration of the fan blades is the greatest problem, and vibration amplitude is minimized by maximizing the elastic modulus (stiffness) of the blade material. In addition it is determined that the Izod impact strength must be a minimum of 100 for sufficient resistance to fracture and fatigue. To control cost it is necessary to select a commodity polymer. Polymers with glass or other material reinforcement are too expensive for this design. What material discussed in this chapter would best suit the design requirements?