The net force acting on an insect falling downward at constant velocity is
A) zero.
B) the weight of the insect.
C) upward air resistance.
D) none of the above
Answer: A
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If 33 atom % Cu is mixed into a Ni crystal at a temperature of 473 K (200°C), determine the change in the GFE relative to segregated Cu and Ni for 1 mole of total atoms if the enthalpy of solution for Cu into Ni is 0.11 eV/atom, according to data in Hultgren et al.
(a) What is the GFE change for the mixing? (b) Based upon your result, should it be possible to mix 33 atom % Cu into Ni at 473 K? Explain your answer and compare this result to the phase diagram in Figure 5.7.
What is the shape of the segmented mirrors of twin Keck Observatory telescopes, Gran Telescopio Canarias, and soon to be launched James Web Space Telescope?
a. spherical b. hexagonal c. rectangular d. triangular e. octagonal
The Coriolis effect is very important to the weather of Venus
Indicate whether the statement is true or false
Which of the following observations confirms that Sgr A at the center of our galaxy is indeed a supermassive black hole?
A) measurements of radio emission from gas around Sgr A B) measurements of occasional X-ray emission from Sgr A C) measurements of the orbits of stars around Sgr A D) measurements of trans-dimensional space warps in the vicinity of Sgr A