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ddd [48]
3 years ago
11

Which direction do all waves travel?

Physics
1 answer:
OleMash [197]3 years ago
7 0
They travel the way the wind is blowing and also towards the shoreline
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D) 50%

Explanation:

According to conservation of momentum:

m_{1} v_{1i} + m_{2} v_{2i} = m_{1} v_{1f} + m_{2} v_{2f}

Assuming that the second taffy started at rest, both pieces have the same mass and that they combined after the collision, their final velocity is:

m v_{1i} = (m+m) v_{f}\\v_{f} = 0.5 v_{1i}

The initial kinetic energy of the system is:

E_{ki} = \frac{m*v_{1i}^2}{2}

Since the second taffy was not moving, it had no kinetic energy at first.

The initial kinetic energy of the system is:

E_{kf} = \frac{2m*v_{f}^2}{2}\\E_{kf} = \frac{2m*(0.5v_{1i})^2}{2}\\E_{kf} = \frac{0.5m*v_{1i}^2}{2}

The percentage of kinetic energy that becomes heat is given by:

H=1 - \frac{E_{kf}}{E_{ki}}\\H=1 - \frac{\frac{0.5m*v_{1i}^2}{2}}{\frac{m*v_{1i}^2}{2}}\\\\H=1- 0.5 = 0.5

THerefore, 50% of the kinetic energy becomes heat

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