Compared to noise, musical sounds commonly have
A) periodic tones.
B) musical notes.
C) both of these
D) neither of these
Answer: C
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Estimate the thickness of a piece of paper
A) 10-4 meter B) 10-5 meter C) 10-6 meter D) 10-7 meter E) 10-8 meter
A 200-N weight hangs motionless from a string that is attached to the ceiling. The net force acting on the weight is
1) zero, 2) 100 N, 3) 200 N, and if the string breaks, the net force acting on the weight will be 4) zero. 5) 100 N. 6) 200 N.
Which of the following provides the strongest evidence to support the claim that there is a black hole at the center of our galaxy?
A) We observe many sources of x-rays near the center of our galaxy. B) Infrared and radio observations show a large concentration of gas near the center of our galaxy. C) The motions of the gas and stars indicate that the galactic center has a mass millions of times that of the Sun within a region less than 1 light-year across. D) We observe a large, dark object that absorbs all light at the center of our galaxy.
Do neutrinos have mass, and how do we know?
A) No, because they are observed to move at lightspeed. B) No, because we have observed that their paths remain straight as they pass through a magnetic field. C) Yes, because we have observed them to transmute from one of the three neutrino types to another. D) Yes, for both of the reasons listed in answers c and d. E) Yes, because we have observed them to move slower than lightspeed.