A spaceship whizzes past a planet at high speed. An observer on the planet sees a contracted spaceship, while an observer on the spaceship sees
A) a contracted planet.
B) an expanded planet.
C) a normal planet.
D) a contracted or expanded planet depending on the direction of travel.
Answer: A
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A ball thrown straight upward takes 10 seconds for its up-and-down round trip. Because of air resistance, the time taken for the ball just to go up is
A) less than 5 s. B) 5 s. C) more than 5 s.
The ideal shape for the primary mirror of a telescope is
a. concave circular. b. convex circular. c. concave parabolic. d. convex parabolic. e. plane.
A wrench is placed at 30 cm in front of a diverging lens with a focal length of magnitude 10 cm. What is the magnification of the wrench?
A) 4.0 B) 0.67 C) -0.67 D) -0.25 E) 0.25
What is the intensity of sound from a band with a sound level of 120 dB? (I0 = 10-12 W/m2)
a. 1 W/m2 c. 10 W/m2 b. 1.2 W/m2 d. 12 W/m2