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HACTEHA [7]
3 years ago
6

which component of a motor causes the magnetic field produced by the coil to regularly reverse and therefore always be repelled

by the fixed magnetic field
Physics
1 answer:
gavmur [86]3 years ago
8 0
Spark altnator spark altnator spark altnator spark altnator 
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Potassium is a crucial element for the healthy operation of the human
Degger [83]

Answer:

1

  The mass of the Potassium-40 is  m_{40}} = 2.88*10^{-6} kg

2

  The Dose per year in Sieverts is   Dose_s = 26.4 *10^{-10}

Explanation:

From the question we are told that

   The isotopes of potassium in the body are Potassium-39, Potassium-40, and Potassium- 41

    Their abundance is 93.26%, 0.012% and 6.728%

   The mass of potassium contained in human body is  m = 3.0 g = \frac{3}{1000} = 0.0003 \ kg per kg of the body

    The mass of the first body is  m_1 = 80 \ kg

Now the mass of  potassium  in this body is mathematically evaluated as

       m_p =  m * m_1

substituting value

       m_p =  80  * 0.0003

      m_p  =0.024 kg

The amount of Potassium-40 present  is mathematically evaluated as

      m_{40}} =0.012% * 0.024

      m_{40}} = \frac{0.012}{100}  * 0.024

      m_{40}} = 2.88*10^{-6} kg

The dose of energy absorbed per year is mathematically represented as

          Dose  = \frac{E}{m_1}

Where E is the energy absorbed which is given as E = 1.10 MeV = 1.10 * 10^6 * 1.602*10^{-19}

    Substituting value

            Dose  = \frac{ 1.10 * 10^6 * 1.602*10^{-19}}{80}

            Dose  = 22*10^{-10} J/kg

The Dose in Sieverts is evaluated as

       Dose_s = REB * Dose

       Dose_s = 1.2 * 22*10^{-10}

       Dose_s = 26.4 *10^{-10}

             

3 0
3 years ago
Why does the mass of a candle decrease after burning?
34kurt
Because when a candle burns the wax is burning off so as its heated more and more wax is lost and if more wax is lost... Obviously it means that the candles mass will be lower :)
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4 years ago
PLS I NEED THIS QUICK! WILL GIVE BRAINLIEST!
9966 [12]
Work is related to potential and Kinetic because your doing something which is working
8 0
3 years ago
Expresiones matemáticas de equivalencia para las diferentes escalas de temperatura.
Vedmedyk [2.9K]

Answer:

Supongo que quieres encontrar las relaciones que te permiten cambiar las escalas de temperatura.

Las 3 escalas de temperatura son:

°C = grado Celcius.

°F = grado Farenheit.

K = grado Kelvin.

Empezamos con °C, pues es la mas conocida.

La diferencia entre consecutivos grados es la misma en la escala Kelvin que en la escala Celcius, pero la escala Kelvin esta definida de tal forma que el cero Kelvin representa la ausencia absoluta de temperatura, mientras que en Celcius podemos tener temperaturas menores a 0 grados.

La transformación entre Celcius y Kelvin es:

x °C = (x + 273.15) K

Es decir, agarramos nuestra temperatura en °C, y le sumamos 273.15 grados.

La transformación entre Celcius y Farenheit es:

x °C = ((x*9/5) + 32) °F

Y la faltante, va a ser de Kelvin a Farenheit, que es:

x K = ( ( (x - 273.15)*9/5) + 32) °F

5 0
3 years ago
The element carbon is found on the right side of the periodic table and is known as a _____, which means that it is normally a p
natali 33 [55]
It is is non-metallic and tetravalent
6 0
4 years ago
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