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azamat
3 years ago
11

Which equation describes the sum of the vectors plotted below?

Physics
2 answers:
andrew-mc [135]3 years ago
6 0

It's the third one in the picture ...

r = 3x - 2y

Crazy boy [7]3 years ago
5 0

Explanation:

From the attached figure, OAB forms a triangle having,

a = (2,1)

b = (3,-2)

Vector, OA = 2x + y

Vector, AB = x - 3 y

The resultant can be calculated using triangular law of vector addition as :

r=OA+AB

r=2x+y+(x-3y)

r=3x-2y

So, the sum of the vectors plotted below is 3x-2y. Hence, the correct option is (c).

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Answer:

An object could be determined as solid:

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-the molecules attached with each other by strong forces, creating strong bonds.

An object could be determined as liquid:

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5 0
4 years ago
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7 0
3 years ago
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Determine the energy required to accelerate an electron from (a) 0.500c to 0.900c and (b) 0.900c to 0.990c
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Answer:

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E_r=0.511\ MeV=Electron rest energy

(a) 0.500c to 0.900c

W=\left(\frac{1}{\sqrt{1-\frac{v_f^2}{c^2}}}-\frac{1}{\sqrt{1-\frac{v_i^2}{c^2}}}\right)E_r\\\Rightarrow W=\left(\frac{1}{\sqrt{1-0.9^2}}-\frac{1}{\sqrt{1-0.5^2}}\right)0.511\\\Rightarrow W=0.582\ MeV

Energy required is 0.582 MeV

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W=\left(\frac{1}{\sqrt{1-\frac{v_f^2}{c^2}}}-\frac{1}{\sqrt{1-\frac{v_i^2}{c^2}}}\right)E_r\\\Rightarrow W=\left(\frac{1}{\sqrt{1-0.99^2}}-\frac{1}{\sqrt{1-0.9^2}}\right)0.511\\\Rightarrow W=2.45\ MeV

Energy required is 2.45 MeV

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