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Explanation:
Scalar product can be calculated using two methods.
1st: vec.A . vec.B = ABcosθ
2nd: Directly, multiply them.
Here,
| A | = √1² + 4² + 1 = 3√2
| B | = √2² + 1² + 2² = 3
So,
ABcosθ = vec.A . vec.B
3 * 3√2 cosФ = (i - 4j - k)(2i + j - 2k)
9√2 cosФ = 2(1) - 4(1) + 2(1)
9√2 cosФ = 0
cosФ = 0
cosФ = cos90*
Hence, angles between them is 90*, means they are perpendicular to each other
Answer:
Himachal Pradesh state
name Poornima
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