Explain why stars displaying spectral lines of molecules must be relatively cool
What will be an ideal response?
Molecules would break up into their constituent atoms in hotter stars.
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"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
Reaction forces are given in terms of load variable P for the truss below. The force in member FD is:
(A) 1.47P
(B) 2.27P
(C) 22.27P
(D) 24.27P
Compare the circular velocities of the satellites and/or moons of Mars and Earth, using Reasoning with Number 4-1 as your guide. Which has the higher velocity and by how much?
What will be an ideal response?
An ideal gas is compressed isobarically to one-third of its initial volume. The resulting pressure will be
A) three times as large as the initial value. B) equal to the initial value. C) more than three times as large as the initial value. D) impossible to predict on the basis of this data.