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

Physics & Space Science

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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

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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

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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

Physics & Space Science

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

Physics & Space Science