This holographic image shows the vibrations in the body of a violin. The sound that reaches your ears from a violin:
a. comes from the air motion directly caused by the vibrating strings.
b. results from the resonant motion of sound box of the violin and the air molecules within it.
c. comes from a speaker system attached to an amplifier in the violin.
d. comes from the violin bow.
e. the small bridge that slightly elevates the violin strings above the sound box.
b
You might also like to view...
Reverberation is a phenomenon you would be most likely to hear if you sing in
A) the shower. B) a small drape-covered room. C) a large drape-covered room. D) the desert.
In regard to the Compton scattering experiment with x-rays incident upon a carbon block, as the scattering angle becomes larger, what happens to the magnitude of difference between the incident and scattered wavelengths?
a. increases b. decreases c. remains constant d. difference is maximum at a 45° angle of scatter
Recently discovered organisms that create their energy through chemical reactions (chemosynthesis instead of photosynthesis) and live in environments previously thought too alkaline, hot, cold, dark, saline, etc. to sustain life
These organisms are collectively called: A) viruses. B) huge crabs. C) extremophiles. D) hydrothermal vents. E) giant red tube worms.
Reconsider the heat exchanger and explore the effect of tube center-to- center spacing in the equilateral array of the finned tubes. Consider the tube spacing of 8.75 cm and 10 cm. What is the extent of change in the average heat transfer coefficient and pressure drop? Likewise, what is the extent of change in the thermal and hydrodynamic performance if a square pitch (inline arrangement is considered) with tube center-to-center spacing of 7.5 cm?
GIVEN
Heated air flowing over an equilateral staggered tube bank
Exhaust gas temperature
Tair,in = 400°C
Number of tube rows (NL) = 10
Tube diameter (D) = 2.5 cm= 0.025 m
Center to center pitch(S) = 7.5 cm=0.075 m
Free stream velocity (Ua) = 2 m/s
Tube surface temperature (Tt) = 175°C
Finned surface extension ration (?)= 1.15
FIND
The average heat transfer coefficient (c h) and pressure drop in gas flow stream.
ASSUMPTIONS
Steady state
Tube wall temperature is uniform and constant
SKETCH
