If a=i+j+4k and b=i+j+2k
Compute the cross product a×b.
If a=i+j+4k and b=i+j+2k Compute the cross product a×b.?
回答 (3)
2020-07-22 7:55 pm
a × b
= (i + j + 4k) × (i + j + 2k)
= (1*2 - 4*1)i + (4*1 - 1*2)j + (1×1 - 1*1)k
= -2i + 2j + 0k
= (i + j + 4k) × (i + j + 2k)
= (1*2 - 4*1)i + (4*1 - 1*2)j + (1×1 - 1*1)k
= -2i + 2j + 0k
2020-07-22 8:46 pm
Hint: What formula, or procedure did you see/learn for the cross product?
Write it here and then we will proceed.
Write it here and then we will proceed.
2020-07-22 10:47 pm
If a = i + j + 4k and b = i + j + 2k
the cross product a × b:
(i + j + 4k)(i + j + 2k) = j^2 + 6 j k + 2 i (j + 3 k) + 8 k^2 - 1
the cross product a × b:
(i + j + 4k)(i + j + 2k) = j^2 + 6 j k + 2 i (j + 3 k) + 8 k^2 - 1
收錄日期: 2021-04-18 18:36:12
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