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3 years ago

Which value is equivalent to 7.2 kilograms? A. 720 grams B. 7,200 grams C. 72,000 grams D. 720 milligrams E. 7,200 milligrams

Physics

2 answers:

Aneli [31]3 years ago

8 0

1 kilogram = 1,000 grams
1 kilogram = 1,000,000 milligrams

Setler79 [48]3 years ago

6 0

If 1 kilogram is = to 1000 grams then 7.2 would = 7,200 because 7.2*1000=7,200 so your answer would be B

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morpeh [17]

Answer:

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Explanation:

We are given that

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We have to determine the energy of the incident electron.

Mass of electron, $m=9.1\times 10^{-31} kg$

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Velocity, $v=\frac{Bqr}{m}$

Using the formula

Speed of electron, $v_1=\frac{Bqr_1}{m}=\frac{0.0370\times 1.6\times 10^{-19}\times 0}{9.1\times 10^{-31}}=0$

Speed of second electron, $v_2=\frac{0.0370\times 1.6\times 10^{-19}\times 0.023}{9.1\times 10^{-31}}$

$v_2=1.5\times 10^8 m/s$

Kinetic energy of incident electron= $\frac{1}{2}mv^2_1+\frac{1}{2}mv^2_2$

Kinetic energy of incident electron= $0+\frac{1}{2}(9.1\times 10^{-31})(1.5\times 10^8)^2=1.02\times 10^{-14} J$

Kinetic energy of incident electron= $\frac{1.02\times 10^{-14}}{1.6\times 10^{-19}}=63750eV=\frac{63750}{1000}=63.750KeV$

1KeV=1000eV

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Answer:

Explanation:

You first have to add all the numbers together.

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315/5 = 63

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