The voltage supplied to an ac circuit is given by v = 120 sin(60t). What are the rms voltage and the frequency?
A. 120 V, 60 Hz
B. 120 V, 380 Hz
C. 170 V, 9.5 Hz
D. 85 V, 9.5 Hz
E. 240 V, 30 Hz
D. 85 V, 9.5 Hz
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The ____________________ are theories that unify the electromagnetic, weak and strong forces at extremely high energies
Fill in the blank(s) with correct word
The reason that evaporation is a cooling process is
A) radiation of heat during the process. B) due to conduction and convection. C) the more energetic molecules escape the liquid. D) all of the above E) none of the above
How long after the Big Bang was the Planck time, the time at which our current theories become completely unable to describe conditions any earlier in the universe?
A) 380,000 years B) 10-35 seconds C) 10-10 seconds D) 10-43 seconds E) 3 minutes
Estimate the distance (in cm) between the central bright region and the third dark fringe on a screen 5.00 m from two double slits 0.500 mm apart illuminated by 500-nm light
a. 3.47 b. 2.15 c. 1.75 d. 1.50 e. 1.25