A piano wire of length 1.5 m vibrates so that one-half wavelength ...

[ishan]

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

Question 2

Suppose that you were selected for a Survivor-type TV show. To help keep your group connected, you suggest that long vines can be tied together and used to transmit signals in cases of emergency. To get the signals to travel faster, you should
 a. select lighter vines.
  b. increase the tension on the vines.
  c. hang weights from the vines at evenly spaced intervals.
  d. do all of the above. e. do (a) or (b) above, preferably both.

[kusterl]

Answer to Question 1

D

Answer to Question 2

E