When you place a stick in water and remove it, the stick is wet. If you instead place it in mercury the opposite occurs. The stick is dry. This is because adhesive forces are greater
A) between stick and water.
B) between the stick and mercury.
C) between the mercury and the water.
D) none of the above
Answer: A
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Three point charges are located on the x-axis. The first charge, 
is at x = -1.00 m; the second charge, 
is at the origin; and the third charge, 
is located at x = 2.00 m. What is the force on 
?
A. 1.65 N in the negative x-direction B. 3.15 N in the positive x-direction C. 1.50 N in the negative x-direction D. 4.80 N in the positive x-direction E. 4.65 N in the negative x-direction
Shapley correctly argued that the rotation of the spiral nebulae proved they could not be very distant
Indicate whether the statement is true or false
Explain how Copernicus would account for the retrograde loops of superior planets
What will be an ideal response?
Quasar spectra often show many absorption lines that all appear to be due to the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows—it remains perhaps the greatest mystery about quasars.