Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0 . What is the distance to Proxima Centauri in units of pc?
a. 0.1 b. 10^0.1
c. 10^–0.1 d. None of the other choices are correct.
b
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The most accurate value of the lattice parameter results from an extrapolation of sin2 ? to _________.
Fill in the blank(s) with the appropriate word(s).
Momentum: Find the magnitude and direction of the net momentum of the system shown in the figure. Express the direction by giving the angle the net momentum makes with the +x-axis.
Fill in the blank(s) with the appropriate word(s).
If a new machine is more efficient than the old model, it uses a smaller amount of energy to do the same task
Why hasn't the experience with all the electric machines over the 130 year history of commercial electricity sales produced a machine that is 100% efficient?
Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a
A) dwarf galaxy. B) spiral galaxy. C) very flat elliptical galaxy. D) very dusty irregular galaxy. E) quasar.