What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many impact craters
B) the characteristics of the Caloris Basin
C) Mercury's unusually high density
D) the presence of many long, tall cliffs
D
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What is the crucial characteristic of an Einstein solid that makes it easier to analyze in the context of this chapter than most other kinds of thermodynamic systems?
A. The atoms are arranged in a regular, cubic lattice. B. The atoms are identical. C. Its microstates are comparatively easy to count. D. Each atom’s energy levels are equally spaced. E. ? (U, N) is always reasonably small. F. Other (specify).
Two charges lie on the x axis, +2q at the origin, and ?3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m. b. 2.0 m. c. 2.5 m. d. 3.0 m. e. 4.0 m.
A hospital patient has been given a sample of 131I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public
How long must the patient wait for the decay rate of the sample to reach the acceptable level? A) 21 days B) 14 days C) 9.9 days D) 8.9 days
Which of these represents an example of simple harmonic motion?
(i) a bouncing ball (ii) a marble rolling back and forth in a concave bowl (iii) a tree branch vibrating (iv) someone walking back and forth across a room, dozens of times
1.all of them 2.(i) and (iv) 3.(ii) and (iii) 4.(i) and (iii)