Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface.
b. A 180o phase change occurs at the outside surface but not at the inside surface.
c. A 180o phase change occurs at both the inside surface and the outside surface.
d. No phase change occurs at either the inside surface or the outside surface of the glass.
a
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A circumferential cast iron fin attached to a compressor housing is 1 inch thick, 3 in long, 3 in diameter, and the convective heat transfer coefficient is 16 Btu/hr?ft^2? ºF. If the base temperature is 160ºF and the surrounding air is 80ºF, determine the fin efficiency and the heat transfer through the fin.
What will be an ideal response?
An inventor tries to sell you his new engine which takes in 40. Joules of heat at 87°C on each cycle, expels 30. Joules at 27°C, and does 10. Joules of work. Why are you not fooled, and can have him prosecuted as a fraud?
What will be an ideal response?
The name of which astronomer is most closely linked with that of Henry Russell?
a. Henrietta Leavitt b. Johannes Kepler c. Ejnar Hertzsprung d. Edwin Hubble
Two identical objects are released from rest from heights R and 2R above the surface of the Earth. After traveling a distance R/2, which object has the larger speed?