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Veronika [31]
3 years ago
14

A mountain slope and a skier make up a closed system with 21,800 J J of energy. When the skier starts her descent down the mount

ain, the mechanical energy of the system is 19,500 J. By the time she reaches the bottom, the system's mechanical energy has fallen to 18,230 J. How much of the total energy is transformed into thermal energy?
A. 2,300 J
B. 3,570 J
C. 20,530 J
D. 1,270 J​
Physics
1 answer:
belka [17]3 years ago
4 0

Answer: 1,270 J

Explanation: APEX

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Directly proportional to the product of the two charges and inversely proportional to the square of the distance between them
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3 years ago
Two gratings A and B have slit separations dA and dB, respectively. They are used with the same light and the same observation s
77julia77 [94]

Answer:

a) dB / dA = 2 ,

b) Network B     Network A

        2                         1

        4                         2

        6                         3

Explanation:

a) The expression for grating diffraction is

         d sin θ = m λ

where d the distance between two slits, λ the wavelength and m an integer that represents the diffraction range

In this exercise we are told that the two spectra are in the same position, let's write the expression for each network

Network A

m = 1

         sin θ = 1 λ / dA

Network B

m = 2

        sin θ = 2 λ / dB

they ask us for the relationship between the distances, we match the equations

            λ / dA) = 2 λ / dB

            dB / dA = 2

         

b) let's write the equation of the networks

         sin θ = m_A  λ / dA

         sin θ = m_B  λ / dB

we equalize

           m_A  λ/ dA = m_B  λ / dB

we use that

          dB / dA = 2

           m_A 2 = m_B

therefore the overlapping orders are

Network B     Network A

   2                         1

   4                         2

    6                       3

4 0
3 years ago
50 Points please Help
Leya [2.2K]

Answer:

Temperature -SI unit :Kelvin

Explanation:

Kelvin is the SI unit of Temperature .

  • Don't get confused and write Celsius as the SI unit .Celsius is not the SI unit .

\\ \sf\longmapsto 1K=273°C

Or

\\ \sf\longmapsto 1°C=273.16K

Lets take an example :-

  • Take 27°C

Lets convert to Kelvin scale

\\ \sf\longmapsto 27°C

\\ \sf\longmapsto 27+273

\\ \sf\longmapsto 300K

  • SI unit of Mass=kilogram(Kg)
  • SI unit of Time=second(s)
  • SI unit of electric current=Ampere(A)
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Answer:

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Hope that helps :)

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3 years ago
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