An example of a transverse wave is a
a. sound wave in air
b. wave on a rope
c. water wave
d. sound wave in a metal bar
e. none of the above
B, C
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A counterflow double pipe-heat exchanger is used to heat 0.8 kg/s of water from 40ºC to 80ºC with oil having specific heat of 2.1 kJ/kg?K. Assume the maximum oil flow can be 1.0 kg/s and that oil enters the heat exchanger at 170ºC. If the overall heat transfer coefficient is 425 W/m^2?K, determine the surface area of the heat exchanger and the effectiveness of the heat exchanger. Equation 9-29 defines the effectiveness.
What will be an ideal response?
When a compressive stress is applied parallel to the fibers of a composite material, cracks form at the fiber-matrix interface due to _________effect strain.
Fill in the blank(s) with the appropriate word(s).
A star's ________ parallax is found by using the spectral lines to estimate the spectral class and luminosity of distant stars
Fill in the blank(s) with correct word
A 20-?F capacitor charged to 2.0 kV and a 40-?F capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-?F capacitor after the two are so connected?
a. 53 mC b. 27 mC c. 40 mC d. 80 mC e. 39 mC