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The projection of the vector hati+3hatj+7hatk on the vector 7hati-hatj+8hatk is |
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Answer» `(60)/(sqrt(122))` ` (a.b) /(|b|)=[((hati +3hatj +7 hatk).(7 hati -hatj+8hatk))/(sqrt(7)^(2)+(-1)^(2)+8^(2))]` `=[(1xx7+3xx(-1)+7xx8)/((sqrt(49)+1+64))]=(7-3+56)/(sqrt(114))=(60)/(sqrt(114))` |
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