Suppose that you were selected for a "Survivor"-type TV show. To help keep your group connected, you suggest that long vines can be tied together and used to transmit signals in cases of emergency. To get the signals to travel faster, you should
a. select lighter vines.
b. increase the tension on the vines.
c. hang weights from the vines at evenly spaced intervals.
d. do all of the above. e. do (a) or (b) above, preferably both.
E
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The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that 
a. the stars are in an elliptical orbit around one another.
b. the mass of the pair can be estimated.
c. one star is passing by the other never to return.
d. both the stars are in an elliptical orbit around one another.
Which statement accurately describes how observations of distant galaxies help us learn about galaxy evolution?
A) By observing galaxies with different lookback times, we learn how galaxies appeared at different stages of their evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can watch as two galaxies merge and view the result, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about
A) 0.2 g. B) 0.3 g. C) 0.4 g. D) 0.5 g. E) greater than 0.5 g.
A child is riding a merry-go-round, which has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/s2. The child is standing 4.65 m from the center of the merry-go-round
What angle does the acceleration of the child make with the tangential direction? A) 90.0° B) 25.5° C) 32.5° D) 64.5° E) 45.0°