A sinusoidal wave of angular frequency 1200 rad/s and amplitude 3,00 mm is sent along a cord with linear density 2.00 g/m and tension 1200 N. (a)What is the average rate at which energy is transported by the wave to the opposite end of the cord? (b)If, simultaneously, an identical wave travels along an adjacent, identical cord, what is the total average rate at which energy is transported to the opposite ends of the two cords by the waves?If, instead, those two waves are sent along the same cord simultaneously, what is the total average rate at which they transport energy When their phase difference is 0, (b)When their phase difference is (c) 0(d) , and (e) is ?
When we set up a wave on a stretched string, we provide energy for the motion of the string. Therefore, energy is transported in the form of both kinetic as well as potential energy. From the speed of the wave, we can calculate the average power of the wave in various situations, that is, the average rate at which energy is transported by the wave.
The velocity of a string, (i)
Average power or energy of a body, (ii)
Amplitude of a wave, (iii)
Using equation (i) and the given values, we get the velocity of the wave as:
Using this speed in the equation (ii), we can get the average energy as:
Hence, the value of average energy rate is 10 W.
If an identical wave travels along an adjacent, identical cord, then the average rate at which energy is transported is twice of that single wave, that is,. No superposition occurs here.
Speed of wave is v = 775 m/s
Hence, using equation (ii), the total average energy rate is given as:
Hence, the value of total average rate by the waves is 20 W
If the phase difference between the two waves is i.e.the two waves will haveconstructive interference,the new amplitude of the wave using equation (iii) is given as:
Then, using equation (i), the average rate at which energy is transported is given as:
Hence, the total average rate when phase is zero is 40 W
Phase difference between two waves is then the new amplitude of the wave using equation (iii) is given as:
From that we can find new average rate of energy transport using equation (i) is given as:
Hence, the value of the total average energy rate is 26W
Phase difference between two waves is then the new amplitude of the wave using equation (iii), we get
From that we can find new average rate of energy transport using equation (i), we get
Hence, the value of the total average rate of energy is 0 W
A rope, under a tension of 200 N and fixed at both ends, oscillates in a second-harmonic standing wave pattern. The displacement of the rope is given by , where x = 0 at one end of the rope, x is in meters, and is in seconds. What are (a) the length of the rope, (b) the speed of the waves on the rope, and (d) the mass of the rope? (d) If the rope oscillates in a third-harmonic standing wave pattern, what will be the period of oscillation?
(a) Write an equation describing a sinusoidal transverse wave traveling on a cord in the positive direction of a y axis with an angular wave number of 60 , a period of 0.20 s , and an amplitude of 3.0 mm. Take the transverse direction to be the direction. (b) What is the maximum transverse speed of a point on the cord?
A 1.50 m wire has a mass of 8.70 g and is under a tension of 120 N. The wire is held rigidly at both ends and set into oscillation. (a) What is the speed of waves on the wire? What is the wavelength of the waves that produce (b) one-loop and (c) two loop standing waves? What is the frequency of the waves that produce (d) one-loop and (e) two-loop standing waves?
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