______________ water has a high content of calcium, magnesium, and iron salts
Fill in the blank(s) with correct word
Hard
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How do we expect that the first Earth-sized extrasolar planets will be discovered (if they exist)?
A) by the transit technique from an observatory in space B) with photographs from a new generation of large, ground-based observatories C) by NASA's Terrestrial Planet Finder mission D) by the Doppler technique
The basic idea of the "string" hypothesis is that the fundamental particles are
A) very tiny hollow spheres. B) tiny loops of infinitely slender material. C) just geometric points (infinitely tiny points). D) made of chocolate fudge. E) infinitely long and infinitely slender objects.
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. (a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle?
What will be an ideal response?
A nearsighted person has a far point of 18 cm. What power contact lenses will allow this person to comfortably see distant objects clearly?
A) +5.6 diopters B) -5.6 diopters C) +0.056 diopters D) -0.056 diopters