You are asked to select a polymer for a design where the temperature could vary between 0°C and 100°C, and it is desired that the polymer’s mechanical properties should not significantly change over this temperature range. What type of polymers would you initially investigate for this design, and why would you make this selection?
What will be an ideal response?
Thermoset polymers, such as epoxy, do not soften significantly over this
temperature range.
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The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?
a. spectral analysis b. photometry c. interferometry d. resolving power e. cosmic analysis
How does degeneracy pressure differ from thermal pressure?
A) Degeneracy pressure continues to be felt even if an object becomes cold, but thermal pressure is drastically reduced as an object gets cold. B) Degeneracy pressure cannot support an object against the crush of gravity, but thermal pressure can. C) Degeneracy pressure can arise in a plasma, but thermal pressure cannot. D) Degeneracy pressure affects stars, but thermal pressure does not.
A small ball is released from rest at position A and rolls down a vertical circular track under the influence of gravity
The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.