The function of the glass fibers in fiberglass is to increase the ______________.
Fill in the blank(s) with the appropriate word(s).
strength
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The Hubble Space Telescope has a higher/better angular resolution than the Keck Telescope in Hawaii because:
A) it has better instruments B) it is above the Earth's atmosphere C) it is unaffected by jitter due to earthquakes D) it has a mirror with a much larger diameter E) it collects X-rays rather than optical light
You're driving in a car at 50 km/h and bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is
A) zero. B) 2 km/h. C) 48 km/h. D) 50 km/h. E) 98 km/h.
Plane Mirrors: A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?
A. 1 5 m/s B. 3 m/s C. 4 m/s D. 5 m/s E. 6 m/s
What do we mean by time dilation in relativity?
A) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. B) It is the idea that relativity makes time dilate, or expand, for people who study it. C) It is a hallucinogenic effect experienced by people who take too much of something. D) It is the idea that time really runs slower in reference frames moving relative to you.