# physics wave

A) Show that the average rate with which energy is transported along a cord by a mechnical wave of frequency f and amplitude D is:
P(average) = 2(pi^2)u v(f^2)(D^2)
v is speed of the wave
u is the mass per unit length (M/L)

B) If the cord is under a tension Ft =100 N and has mass per unit length 0.10 kg/m, what power is required to transmit 120 Hz waves of amplitude 2.0 cm?

For part b, I think I got the answer, I just plug in the numbers with (root (100N/.10kg/m)) = v, right?
I'm not sure how to prove part A though.

1. 👍 0
2. 👎 0
3. 👁 336
1. A pane progresive is represented by the equation y=0.1sin into 200 wath is the frequency, wavelength, wave speed

1. 👍 0
2. 👎 0
2. hand sketch of polygens

1. 👍 0
2. 👎 0

## Similar Questions

1. ### PHYSICS

A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. What is the spring constant of the bungee cord?

2. ### Science (energy)

1. What similarities do nuclear energy and chemical energy share? Choose all that apply. A. Both are types of kinetic energy. B. Both are types of potential energy. [CORRECT!] C. Both involve magnetic energy. D. Both involve

3. ### physics help plz

One 3.5 kg paint bucket is hanging by a massless cord from another 3.5kg paint bucket, also hanging by a massless cord, as shown in the figure . Part a) If the buckets are at rest, what is the tension in lower and higher cord ?

4. ### Physics

One 2.5 kg paint bucket is hanging by a massless cord from another 2.5 kg paint bucket, also hanging by a massless cord, as shown in Fig. 4-44. (a) If the buckets are at rest, what is the tension in each cord? (lower cord)________

1. ### Physics

A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b)

2. ### Physics

A 17.0 kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 220N and breaks as the elevator accelerates. What was the elevator's minimum acceleration (magnintude and

3. ### History

4.)Which type of energy in the bungee cord prevents the bungee jumper from hitting the ground after a jump? A.)Kinetic energy B.)Elastic potential energy C.)Magnetic potential energy D.)Thermal energy

4. ### Physics

Suppose that a simple pendulum consists of a small 66.0 g bob at the end of a cord of negligible mass. Suppose that the angle between the cord and the vertical is given by θ = (0.0800 rad) cos[(4.30 rad/s)t + ϕ] (a) What is the

1. ### Physics

A small block with a mass of m = 0.120 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.40 m from the hole with a speed of 0.70 m/s. The

2. ### Math

Andie bought 4.85 meters of cord. The cord costs $0.98 per meter. What was the total cost of the cord? My answer is$5.83 Is that correct?

3. ### Physics

A cord has two sections with linear densities of 0.10 kg/m and 0.20 kg/m respectively. An incident wave, y(x,t) = 0.050sin(6.0x - 12.0t), where x is in meters and t in seconds, travels from the lighter cord to the heavier one.

4. ### physics

A block of mass M hangs from a rubber cord. The block is supported so that the cord is not stretched. The unstretched length of the cord is L0 and its mass is m, much less than M. The "spring constant" for the cord is k. The block