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Nina [5.8K]
2 years ago
12

A race car starts at rest and accelerates north at 12.27 m/s2 for 3.19 seconds. What

Physics
1 answer:
IRISSAK [1]2 years ago
8 0
Final velocity is equal to initial velocity plus at (where a is acceleration and t is time), so Vf = Vi + at

Using that formula;

Vf = 0 + 12.27(3.19)

Vf = 39.14 m/s

Note: you started from rest, so your initial velocity is 0.
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The microwaves in a certain microwave oven have a wavelength of 12.2 cm. How wide must this oven be so that it will contain five
leva [86]

Answer:

a

 l = 0.305 \  m

b

  f = 3.0*10^{11} \  Hz

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From the question we are told that

  The  wavelength is  \lambda  =  12.2 \  cm  = 0.122 \  m

  The  number of antinodal planes of the electric field considered is n  =  5

The  width is mathematically represented as

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     \lambda_k  =  \frac{ \lambda *  \frac{0.04}{2} }{n/2}

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So

   f =  \frac{3.0*10^{8}}{0.000976}

    f = 3.0*10^{11} \  Hz

   

       

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