The surface of which jovian moon most resembles the pack ice of the Arctic Ocean?
A) Amalthea
B) Io
C) Europa
D) Ganymede
E) Callisto
C
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Increasing the diameter of a reflecting telescope:
A) increases its light-gathering power. B) decreases its resolving power. C) decreases its magnifying power. D) increases its chromatic aberration.
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m
Which of the following statements about the "helium flash" is correct?
A. It releases enough energy to change the degenerate gas in the core to normal gas. B. It does not occur in high-mass stars. C. It marks the end of the red giant stage for a star like the Sun. D. It does not occur in stars smaller than 0.5 solar masses. E. All of these choices are correct.
Which star is older?
A) an M star in the globular cluster M13 B) an A star in the globular cluster M13 C) Both stars (the A and M star) are the same age.