What thermodynamic quantity is held constant in Boyle's law?
a. pressure
b. volume
c. temperature
d. Both pressure and volume are each held constant.
c
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An aluminum alloy with 4 wt % copper is to be precipitation-hardened. The alloy is solution-treated and quenched, and after the quench the shear yield strength is 38 × 106 Pa. Assume that the copper atoms remain in solid solution after the quench. The alloy is then artificially aged to a shear yield strength of 180 × 106 Pa. Determine the spacing between the precipitate particles that could produce this increase in yield strength. The shear modulus of this alloy is 27 × 109 Pa, the lattice parameter (a) of the aluminum alloy is 0.404 × 10-9 m, and aluminum is FCC with an atom at each lattice site.
What will be an ideal response?
You use the Doppler method to discover a planet around a nearby star that is very similar to the Sun; the velocity curve that has a period of 6 months. What can you conclude about the planet's orbital distance?
A) The planet's orbital distance is greater than 1 AU. B) The planet's orbital distance cannot be determined based on the information provided. C) The planet's orbital distance is less than 1 AU. D) The planet's orbital distance is exactly 1 AU.
For increased atmospheric pressure, the boiling point of water
A) goes down. B) rises. C) remains at 100 degrees C.
Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3
a. 71 b. 52 c. 67 d. 191 e. 208