Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^?3 N/s/m3). The water is 9.0 cm deep and is allowed to stand for 25 minutes. What is the greatest terminal velocity of the particles still in suspension at that time?
a. 3.0E–5 m/s
b. 4.5E–5 m/s
c. 7.5E–5 m/s
d. 6.0E–5 m/s
e. 8.4E–5 m/s
d
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Cosmic rays are made of photons
a. True b. False Indicate whether the statement is true or false
Simple Harmonic Motion: The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?
A. 30.5 µs B. 15.3 µs C. 95.8 µs D. 0.191 ms E. 9.71 µs
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 22 km/s/million light-years. How fast would a galaxy 1000 million light-years away be receding from us?
A) 22 km/s B) 22 million light-years/s C) 22,000 km/s D) 1000/22 km/s E) 0.22 times the speed of light
Most cosmologists favor the Big Bang theory over other cosmological theories because of
a. a 3-to-1 ratio of hydrogen to helium in stars and interstellar matter. b. cosmological redshifts. c. the cosmic microwave background. d. all of the above.