The escape speed at the event horizon of a black hole is c, 300,000 km/sec
Indicate whether the statement is true or false
TRUE
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A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A) 0.050 m/s2 B) 1.4 m/s2 C) 48 m/s2 D) 200 m/s2 E) 0.00 m/s2
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4 sin (5x) cos (6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
Compounds:
a. always have the same major characteristics as their component elements. b. never have the same major characteristics as any of their component elements. c. often consist of a single element. d. are often surprisingly different from their component elements. e. have characteristics that can be easily predicted if you know the component elements.
At temperatures above 0.80 of the melting temperature and at very low stress, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide (c) Dislocation creep (d) Herring-Nabarro vacancy flux