The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
A. 0
B. 0.25
C. 0.50
D. 0.79
E. 1.0
Answer: B
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A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x = 4.0 m and y = -4.0 m because of this charge?
A) 18 × 103 V B) -18 × 103 V C) 0 V D) 36 × 103 V E) -36 × 103 V
The Galactic Year is the time for our solar system to orbit the Galaxy; it is about
A) 15 million years. B) 225 million years. C) 4.5 billion years. D) 9.6 billion years. E) 13.5 billion years.
A person with normal eyesight uses a converging lens of focal length 10 cm as a magnifying glass to finish an engraving job. To see detail, he holds the lens very close to his eyes. At what minimum distance from the job must he hold the lens?
A) 20 cm B) 30 cm C) 14 cm D) 9.4 cm E) 7.1 cm
Do you think it is possible that a carbon star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?