A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30-kg mass hanging from it at the 60-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced
a. 74 cm
b. 70 cm
c. 65 cm
d. 86 cm
e. 62 cm
b
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Suppose an audible sound wave were being produced at a frequency of 800 cycles per second. If the frequency were doubled, the sound would become
A. softer. B. louder. C. higher in pitch. D. lower in pitch.
Gas and dust released by a comet's icy nucleus produce a(n) _______________ and are then blown outward, away from the Sun
Fill in the blank(s) with correct word
A radio galaxy whose lobes are swept back as if forming a tail. This probably indicates that:
A) this is evidence for intergalactic matter. B) the galaxy is about to evolve into a spiral. C) the galaxy is isolated, not part of a cluster. D) the galaxy is moving towards Earth. E) there must be another galaxy nearby.
How does the interstellar medium obscure our view of most of the galaxy?
A) The small mixture of dust grains in the interstellar medium absorbs visible light. B) Dust reflects most light from distant regions of the galaxy back towards the source. C) Hydrogen gas produces so much visible light that the interstellar medium is opaque, blocking our view of anything beyond it. D) Molecules in the interstellar medium absorb all wavelengths of light. E) all of the above