For the E-glass and epoxy composite material in Problem 12.1, calculate the thermal conductivity (kT) in the parallel and transverse directions to the fiber axis. The thermal conductivity of E-glass is 13 Wm-1 K-1 and for epoxy it is 0.1 Wm-1 K-1 .
What will be an ideal response?
For the parallel direction the thermal conductivity is given by the rule of mixtures
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What is the difference between a planetary nebula and a supernova remnant?
What will be an ideal response?
Which one of the following reactions is the most similar chemically to combustion?
A) fusion in stars B) vaporization in the atmosphere C) respiration in animals D) fission in nuclear reactors E) photosynthesis in plants
Planck's constant is about 7 × 10-34, in metric units. Suppose that Planck's constant were larger than it is actually is. Which of the following would then occur?
A) Individual photons would have larger energies, making it easier to observe individual photons. B) Individual photons would have larger wavelengths, making it easier to observe individual photons. C) Individual photons would move faster, even though the overall wave speed of electromagnetic radiation would not change. D) Individual photons would have shorter wavelengths, making it harder to observe individual photons. E) Individual photons would have smaller energies, making it harder to observe individual photons.
The amount of energy converted to light by an incandescent light bulb is about
A) 10% and the amount converted to heat about 90% B) 90% and the amount converted to heat about 10%. C) either of these depending on the brand.