The Hubble Space Telescope
a. has a flawed primary mirror
b. has been repaired
c. has failed
d. none of the above
A, B
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Which of the following is not a property of a ceramic such as alumina?
(a) A high melting temperature (b) A high resistance to fracture (c) It is a good insulator. (d) It is inorganic.
Why do today's high tides arrive about an hour later than yesterday's tides?
A. The tidal bulges include dry land as well as water, and dry land responds to the tidal forces more slowly. B. The gravitational pull of the Sun on the tidal bulges slows their flow around Earth. C. Friction between the surface of Earth and the water slow the water's motion. D. The Moon rises and sets about an hour later every day, and the tides follow the Moon.
A sound level of 80 dB has __________ times the amplitude of a 60 dB sound
Fill in the blank(s) with correct word