The Sun's average surface (photosphere) temperature is about ________
A) 1,000 K B) 5,800 K C) 1,000,000 K D) 37,000 K
B
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Dimensional Analysis: The period P of oscillation of a pendulum (the time interval needed to complete one full oscillation) can be expressed in terms of the mass m of the plumb bob, the length L of the string, and the acceleration due to gravity, g, as P =kmbLcgd, where k, b, c, and d are dimensionless constants. What must be the values of b, c, and d?
What will be an ideal response?
The large planetesimals would have grown faster than the smaller planetesimals because
a. they were moving faster in their orbits than the smaller planetesimals. b. their stronger gravity would pull in more material. c. there was more material located near them that could be accreted. d. the smaller planetesimals were covered by a layer of material that was lost during collisions. e. All of the other choices are correct.
Why aren't small asteroids spherical in shape?
A) The strength of gravity of small asteroids is less than the strength of the rock. B) Small asteroids have odd shapes because they were all chipped off larger objects. C) Large asteroids became spherical because many small collisions chipped off pieces until only a sphere was left; this did not occur with small asteroids.
What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365 B. 4.860 C. 5.250 D. 3.375