Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
a. 269 Hz
b. 254 Hz
c. 264 Hz
d. 5 Hz
e. 274 Hz
A
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A turbine blade 5-cm-long, with cross-sectional area A = 4.5 cm2 and perimeter P = 12 cm, is made of a high-alloy steel [k = 25 W/(m K)]. The temperature of the blade attachment point is 500°C and the blade is exposed to combustion gases at 900°C. The heat transfer coefficient between the blade surface and the combustion gases is 500 W/(m2K). Using the nodal network shown in the accompanying sketch, (a) determine the temperature distribution in the blade, the rate of heat transfer to the blade and the fin efficiency of the blade and, (b) compare the fin efficiency calculated numerically with that calculated by the exact method.
GIVEN
Turbine blade exposed to combustion gases
FIND
(a) Blade temperature distribution, heat gain, and fin efficiency
(b) Fin efficiency calculated exactly
ASSUMPTIONS
The convection coefficient applies at the blade tip
SKETCH
A series circuit has a 50-Hz ac source, a 40-? resistor, a 0.70-H inductor, and a 60-?F capacitor, as shown in the figure. The rms current in the circuit is 1.6 A. What is the voltage amplitude of the source?
A. 390 V B. 330 V C. 270 V D. 220 V E. 190 V
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod
a. True b. False Indicate whether the statement is true or false
To change the fundamental frequency of a guitar string, you can
A. strum it over the sound hole. B. do nothing short of using a completely different guitar. C. use something other than a pick. D. make it shorter, by pressing a finger of your left hand on the string.