Showing 261 to 270 of 327 Questions
  • The function y(x, t) = (15.0 cm) cos (πx – 15πt), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y = +12.0 cm?

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    443
  • The heaviest and lightest strings on a certain violin have linear densities of 3.0 and 0.29 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?

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    271
  • The linear density of a string is l6 x 10-4 kg/m. A transverse wave on the string is described by the equation y = (0.021 m) sin [(2.0m-1)x + (30 s-1)t]. What are? (a) The wave speed and (b) The tension in the string?

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    86
  • The linear mass density of a nonuniform wire under constant tension decreases gradually along the wire so that an incident wave is transmitted without reflection. The wire is uniform for – ∞ ≤ x ≤ 0. In this region, a transverse wave has the form y(x, t) = 0.003 cos (25x – 50t), where y and x are in meters and t is i

    1
    356
  • The listener moves at 80 m/s relative to still air toward the stationary source. (a) What is the wavelength of the sound between the source and the listener? (b) What is the frequency heard by the listener?

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    84
  • The listener moves at 80 m/s relative to the still air away from the stationary source. Find the frequency heard by the listener.

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    72
  • The noise level in an empty examination hall is 40 dB. When 100 students are writing an exam, the sounds of heavy breathing and pens traveling rapidly over paper cause the noise level to rise to 60 dB (not counting the occasional groans). Assuming that each student contributes an equal amount of noise power, find the noise level to the ne

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    110
  • The pendulum on a grandfather clock is calibrated so its period equals 1.00 s. (a) What is the length of the pendulum cable? (b) If the grandfather clock is moved to the moon where the acceleration due to gravity is 1.62 m/s2, will the clock keep the correct time? (c) If not, what can be done to the pendulum to correct the problem?

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    89
  • The sound source described above moves with a speed of 80 m/s relative to still air toward a stationary listener. (a) Find the wavelength of the sound between the source and the listener.(b) Find the frequency heard by the listener.

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    82
  • The source moves away from the stationary listener at 80 m/s. (a) Find the wavelength of the sound waves between the source and the listener. (b) Find the frequency heard by the listener.

    0
    72
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