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Elina [12.6K]
3 years ago
14

A car travels at 90 km per hour how much distance in metre does the car travel in 25 seconds​

Physics
1 answer:
Volgvan3 years ago
3 0

Answer:

  1. 90000m÷3600s=25m
  2. 25m×25s=625ms
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maksim [4K]

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The  value is   \alpha =  0.002 Np/m

Explanation:

From the question we are told that

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  The first  depth  is  D_1 =  10 \  m

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Generally from the spatial wave equation we have

   v(x) =  Ae^{-\alpha d}cos(\beta x  + \phi_o)

=>       \frac{v(x)}{v(x)} =\frac{  Ae^{-\alpha d}cos(\beta x  + \phi_o)}{ Ae^{-\alpha d}cos(\beta x  + \phi_o)}

So considering the ratio of the equation for the  two depth

\frac{A}{A_S}  =  \frac{e^{-D_1 \alpha }}{e^{-D_2 \alpha }}

=>   \frac{98.02}{81.87}  =  \frac{e^{-10 \alpha }}{e^{-100 \alpha }}

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3 years ago
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