Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75
b. 0.25
c. 1.3
d. 12
e. 3.0
a
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Which of the conservation laws listed below is violated by the reaction 
A. baryon number B. electron-lepton number C. muon-lepton number D. charge E. tau-lepton number
When work is done by a system and heat is subtracted, the temperature of the system
A) increases. B) decreases. C) remains unchanged.
A sample of water that is 99.9999 percent pure contains 0.0001 percent impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × Image) molecules
If 0.0001 percent of these molecules were the molecules of some impurity, about how many impurity molecules would this be? A) 1000 (one thousand: 1 × Image) B) 1,000,000 (one million: 1 × Image) C) 1,000,000,000 (one billion: 1 × Image) D) 1,000,000,000,000,000,000 (one million trillion: 1 × Image)
An amount of work equal to 3.0 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 15 g marble?
a. 14 m/s c. 18 m/s b. 15 m/s d. 20 m/s