A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?

a. 21 W
b. 11 W
c. 5.4 W
d. 2.2 W
e. 1.1 W


d

Physics & Space Science

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Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?

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Three resistors, 10 ?, 20 ?, and 30 ?, are wired in series and connected to a 120-V battery. How much current flows in the circuit?

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