One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship
At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A) (a) 20 y (b) 30 y
B) (a) 30 y (b) 50 y
C) (a) 50 y (b) 70 y
D) (a) 70 y (b) 90 y
C
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The peculiar system SS 433 I. is emitting beams of energy and matter. II. is producing a spectrum with both a red and a blue shift. III. probably contains an accretion disk. IV. is the result of a planetary nebula
a. I b. III c. II & III d. I, II, & III e. I, II, III, & IV
Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. 
At what value of t is the speed of the particle equal to 0 m/s?
A. 0 s B. 1 s C. 2 s D. 3 s E. 4 s
Halos are most often observed in the ____________ time of the year
a. spring b. summer c. fall d. winter
Which of the following picture might best describe a soap or detergent?
A) a B) b C) c D) d E) none of the above