From the viewpoint of an alien astronomer, how does Jupiter affect observations of our Sun?
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years.
B) It makes the Sun periodically get somewhat brighter.
C) It makes the Sun appear dimmer when viewed with infrared light.
D) It causes the Sun to move in a small ellipse in the sky, with the same ellipse repeated every night.
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years.
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Equilibrium: An object is being acted upon by three forces and as a result moves with a constant velocity. One force is 60.0 N along the +x-axis, and the second is 75.0 N along the +y-axis. What is the magnitude of the third force?
A. 135 N B. 15.0 N C. 48.0 N D. 67.5 N E. 96.0 N
If the stars at the turnoff point of a cluster have a mass of 3M, what is the age of the cluster?
a. 3.0×10^10 years b. 3.3×10^9 years c. 6.4×10^8 years d. 1.6×10^11 years e. The age of a star cluster cannot be determined from the mass of stars at the turnoff point.
In order to understand star clusters, we need to be able to estimate their ages. What technique do scientists use for this?
A) radioisotope dating B) counting the planets that have formed around the largest stars C) finding the main-sequence turnoff point of the stars D) calculating orbital parameters using Kepler's Laws E) measuring its parallax
Although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is
A) a fraction of a centimeter per second. B) many centimeters per second. C) the speed of a sound wave. D) the speed of light. E) none of the above