The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m.
b. 0.0000034 m.
c. 0.00034 m.
d. 0.34 m.
e. 340,000,000 m.
c
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Give a physical explanation of each of these 3 groups and explain when you expect Bo and Ja to exert a significant influence and when their respective influence is negligible.
GIVEN
? Three of the dimensionless groups upon which the condensation Nusselt number depends
FIND
(a) Physical explanation for the three groups
(b) When Ja and Bo are important
A sphere of pure U-235 will explode if it is
A) hot enough. B) shaken hard enough. C) big enough. D) none of the above
Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor b. fixed resistor, variable inductor c. fixed inductor, variable capacitor d. fixed capacitor, variable resistor
A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 3.000 ? at 20.0°C and increases to 4.850 ? as the indium starts to melt. ?tungsten = 4.50 × 10^?3 (°C)?1 . What is the melting temperature of indium?
a. 132°C b. 157°C c. 351°C d. 731°C