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CBSE Class 12-science Answered

Please help me with this question
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Asked by akshitaasia | 19 Mar, 2018, 11:04: AM
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begin mathsize 16px style Let space top enclose straight a equals 2 straight i with hat on top minus straight j with hat on top minus straight k with hat on top space and space straight b with bar on top equals straight i with hat on top plus 2 straight j with hat on top plus straight k with hat on top Projection space of space top enclose straight a space in space the space direction space of space straight b with bar on top is space equals fraction numerator straight a with bar on top times straight b with bar on top over denominator open vertical bar straight b with bar on top close vertical bar end fraction equals fraction numerator open parentheses 2 straight i with hat on top minus straight j with hat on top minus straight k with hat on top close parentheses times open parentheses straight i with hat on top plus 2 straight j with hat on top plus straight k with hat on top close parentheses over denominator square root of 1 squared plus 2 squared plus 1 to the power of 1 end root end fraction equals fraction numerator 2 cross times 1 plus open parentheses negative 1 close parentheses cross times 2 plus open parentheses negative 1 close parentheses cross times 1 over denominator square root of 1 plus 4 plus 1 end root end fraction equals fraction numerator 2 minus 2 minus 1 over denominator square root of 6 end fraction equals fraction numerator negative 1 over denominator square root of 6 end fraction end style
Answered by Sneha shidid | 19 Mar, 2018, 11:24: AM

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CBSE 12-science - Maths
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Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
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CBSE 12-science - Maths
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CBSE 12-science - Maths
  If a vectors = 2 i – 4 j + 5 k then find value of lamda so that lamda times a (vector) may be a unit vector  i  j and k are unit vector/axis
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CBSE 12-science - Maths
Please help me with this question
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Asked by akshitaasia | 19 Mar, 2018, 11:04: AM
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CBSE 12-science - Maths
Find the distance between the point A(– 1, 2, 3) and B(1, – 1, – 3).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
Find the vector joining the points P(– 2, – 3, 4) and Q(3, 2, 5) directed from P to Q. Also find the distance between the points.
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CBSE 12-science - Maths
If , then find the value of
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
Find the position vector of mid-point of joining the points (6, – 2, 3) and (4, 2, –5).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
If P, Q and R have position vectors (0, 0, 2), (2, 0, 0) and (0, 1, 0). Show that is an isosceles.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Maths
The position vectors of A, B and C are and . Prove that A, B and C are collinear.
Asked by Topperlearning User | 03 Mar, 2015, 01:45: PM
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