science
Grade-11
Easy
Question
Find the angle that the vector A = 2i+3j-k makes with x-axis.
- 52.3
- 57.9
- 30
65.3
- 74.5
Hint:
57.9
The correct answer is: 57.9
a = 2i + 3j - k
√( 2² + 3² + (-1)² ) = √14
Angle with the x-axis
α = cos-1 (2/√14) = 57.68
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