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AleksandrR [38]
3 years ago
11

A baseball player throws 4 balls every 20 seconds. what is his throw frequency

Physics
1 answer:
frosja888 [35]3 years ago
3 0

Answer:

Frequency, f = 0.2 Hz

Explanation:

We have,

A baseball player throws 4 balls every 20 seconds.

It is required to find the frequency of the baseball.

Frequency of an object is defined as the number of times an event occurs. It is given by number of throws per unit time. It can be given by :

f=\dfrac{4}{20}\\\\f=0.2\ Hz

So, the frequency of his throw is 0.2 Hz.

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A diffusion couple, made by welding a thin onecentimeter square slab of pure metal A to a similar slab of pure metal B, was give
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Answer:

The value  is    H  =  18*10^{2} \  Atom / sec

Explanation:

From the question we are told that

  The atom fraction of metal A at point G is A  =  0.30 \ m

   The atom fraction of metal  A at a distance 5000nm from G is  A_2 = 0.35

   The number of atoms per m^3 is    N_h =  9 * 10^{28}

    The diffusion coefficient is  D =   2* 10^{-14 } m^2/s

Generally of the concentration of atoms of metal A at G is  

       N_A = A * N_h

=>    N_A =  0.3  * 9 * 10^{28}

=>     N_A =   2.7 * 10^{28} 2.7 atoms/m^3

Generally of the concentration of atoms of metal A at a distance 5000nm from G is  

       D =  0.35 *9 * 10^{28}

=>     D =  3.15 * 10^{28} \  atoms / m^3

The concentration gradient is mathematically represented as

   \frac{dN_A}{dx}  =  \frac{(3.15 - 2.7) * 10^{28} }{5000nm - 0 }

=> \frac{dN_A}{dx}  =  \frac{(3.15 - 2.7) * 10^{28} }{[5000 *10^{-9}] - 0 }  

=>   \frac{dN_A}{dx}  = 9 * 10^{20} / m^4  

Generally the flux of the atoms per unit  area according to Fick's Law  is mathematically represented as

       J =  -D* \frac{d N_A}{dx}

=>    J =  -2* 10^{-14 * 9 * 10^{20}

=>    J =  18*10^{6}\   atoms\ crossing\ /m^2 s

Generally if the cross-section area is a  =  1 cm^2 =  10^{-4} \  m^2

Generally the number of atom crossing the above area  per second is mathematically is  

      H  =  18*10^{6}    *  10^{-4}

=>    H  =  18*10^{2} \  Atom / sec

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