How do the spectra of giants, supergiants, and main-sequence stars differ?
What will be an ideal response?
Supergiants have very narrow spectral lines, and main-sequence stars have broad lines. Giant stars have spectral lines in between these two.
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If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by
A) two. B) four. C) eight.
A wave travels an average distance of 6 m in 0.5 s. What is the wave's average velocity?
A) less than 0.2 m/s B) 1 m/s C) 3 m/s D) 6 m/s E) more than 6 m/s
In larger craters, the deformation of the rock can form one or more concentric inner rings with the outer rim, producing _____
a. ejecta blanket b. maria c. sinuous rilles d. central peak e. multiringed basin
Snell's Law: Light enters air from water. The angle of refraction will be
A. greater than the angle of incidence. B. equal to the angle of incidence. C. less than the angle of incidence.