Kepler's first law states that Earth's orbit around the Sun takes the shape of a(n) ______________
Fill in the blank(s) with correct word
ellipse
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The velocity needed to stay in a round orbit is called the__________
A) circular velocity B) linear velocity C) vertical velocity D) horizontal velocity
How is a luminosity class assigned to a star?
a. by combining the apparent magnitude with the star's parallax b. by measuring the period of variability in the star's apparent magnitude c. by studying the absorption line width in the spectrum of the star d. by observing the angular size of the star's image in a photograph or digital image
One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm2 . Then 100 milliliters of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube
A horizontal desk surface measures 1.3 m by 1.0 m. If the Earth's magnetic field has a magnitude of 0.44 mT and is directed 65
below the horizontal, what is the magnetic flux through the desk surface?
a. 
b. 
c. 
d. 