Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
A) Arnold, of course.
B) Suzie, surprisingly.
C) both the same, interestingly.
Answer: C
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What is Hubble's law?
A) The longer the time period between peaks in brightness, the greater the luminosity of the Cepheid variable star. B) The recession velocity of a galaxy is directly proportional to its distance from us. C) The recession velocity of a galaxy is inversely proportional to its distance from us. D) The faster a spiral galaxy's rotation speed, the more luminous it is. E) The faster a spiral galaxy's rotation speed, the less luminous it is.
A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 72 dB to 47 dB
The factor, by which the acoustic power entering the chamber is reduced by the glass window, is closest to: A) 3.2 × 10-3 B) 2.2 × 10-2 C) 5.6 × 10-2 D) 1.0 × 10-1 E) 1.5 × 10-1
Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
a. rotates faster than expected in its outer region. b. rotates more slowly than expected in its outer region. c. is only visible during a total eclipse of our sun d. is surrounded above, below and well beyond by the brightly glowing corona.
Uranus's moon Miranda is marked by oval patterns of grooves known as _______________
Fill in the blank(s) with correct word