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Home > Science > Two vectors A and B have precisely equal magnitudes. For the magnitude of A + B to be 78 times greater than the magnitude of A - B, what must be the angle between them?

Two vectors A and B have precisely equal magnitudes. For the magnitude of A + B to be 78 times greater than the magnitude of A - B, what must be the angle between them?

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wilfred_cho | 00:54 Tue 21st Sep 2010 | Science
2 Answers
not 130° not 178°
prev Vectors A and B have equal magnitudes of 4.98. If the sum of A and B is the vector 6.34j, determine the angle between A and B.
  
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vascop
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1.47 degrees. If you want details then ask and I'll provide them.
15:34 Tue 21st Sep 2010
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1.47 degrees. If you want details then ask and I'll provide them.
15:34 Tue 21st Sep 2010
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I agree with Vascop - approx. 1.47°
This is considerably easier to work out than the other vector question..............
11:18 Wed 22nd Sep 2010

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Two vectors A and B have precisely equal magnitudes. For the magnitude of A + B to be 78 times greater than the magnitude of A - B, what must be the angle between them?

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