The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s velocity is negative in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions
c
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The ecliptic is
a. the centerline of the zodiac. b. the projection of Earth's orbit on the sky. c. the apparent path of the sun around the sky. d. all of the above e. none of the above
Suppose we place a 100-g aluminum block with an initial temperature of 100°C in a Styrofoam cup containing a 100-g sample of water at 0°C. (The specific heats of aluminum and water are 900 J·kg-1K-1 and 4200 J·kg-1K-1, respectively.) The system’s final temperature is closest to
A. 0°C. B. 20°C. C. 50°C. D. 80°C. E. 100°C.
What is the most accurate way to determine the distance to a distant galaxy (a galaxy that is too far away for us to see individual stars)?
A) radar ranging B) parallax C) using Cepheid variables D) using white dwarf supernovae
A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thinner and lighter. What is the orientation of the reflected and transmitted pulses?
A) Both pulses are right side up. B) The reflected pulse returns right side up while the transmitted pulse is inverted. C) The reflected pulse returns inverted while the transmitted pulse is right side up. D) Both pulses are inverted.