The diagram below is an HR diagram. The line indicates the location of the main sequence. Which of the five labeled locations on the HR diagram indicates a luminosity and temperature similar to that of a T Tauri star?
a.
1
b.
2
c.
3
d.
4
e.
5
D
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Suppose we looked at this image without its overlay of radio emission (that is, we looked only at the visible-light image). What features of the image would no longer be visible? Select all that apply.
A) the background galaxies B) the central galaxy C) the jets D) the lobes
The velocity of an object as a function of time is given by v(t) = -3.0 m/s - (2.0 m/s2 ) t + (1.0 m/s3 ) t2. Determine the instantaneous acceleration at time t = 2.00 s
A) -5.0 m/s2 B) 2.0 m/s2 C) -18 m/s2 D) -3.0 m/s2 E) 18 m/s2
Where would you least expect to find an ionization nebula?
A) in the galactic disk B) near a hot, young star C) in a spiral arm D) in the halo of our galaxy
A lunar eclipse occurs when the
A) Sun passes into Earth's shadow. B) Moon passes into Earth's shadow. C) Earth passes into the Sun's shadow. D) Earth passes into the Moon's shadow.