Every second at Niagara Falls, some 5000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment)
8360 kJ/K
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Approximately how long did the nucleosynthesis era last?
A) 10-10 seconds B) 5 years C) 5 minutes D) 0.001 seconds E) 5 seconds
Using graphical techniques estimate the temperature distribution through the cast iron engine block and head shown in Figure 2-63.
Impedance: What inductance must be put in series with a 200-? resistor at 4.00 kHz to have a total impedance of 240 ??
A. 3.28 mH B. 4.28 mH C. 5.28 mH D. 6.28 mH E. 12 mH
Standing waves are produced by the superposition of two waves with
A. the same amplitude, frequency, and direction of propagation. B. the same amplitude, frequency, and opposite direction of propagation. C. the same amplitude, different frequencies, and opposite direction of propagation. D. the same amplitude, different frequencies, and same direction of propagation.