In an AC circuit the voltage varies as V = 96. sin (277 t) volts
(a) What is the rms voltage?
(b) What is the frequency?
(a) 68. V
(b) 44.1 Hz
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Addition by 1. Components: The figure shows three vectors, 
, 
, and 
, having magnitudes 7.0 cm, 6.0 cm, and 4.0 cm, respectively. Find the x and y components of the resultant of these three vectors.
What will be an ideal response?
You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a. 0. b. mgr. c. 2mgr. d. a function of the angular velocity. e. small at first, then increasing as the Frisbee loses the torque given it by your hand.
Which of the following are the units of a henry and a farad, respectively?
a. J ? s2/C2 and C2/J b. V ? s/A and V/C c. V/(A ? s) and C/V d. N ? m/A2 and 1/J e. None of the above
How much power is theoretically available from a mass flow of 1000 kg/s of water that falls a vertical distance of 50 m?
a. 980 kW c. 4900 W b. 98 kW d. 490 kW