Find the magnitude and direction angle (in degrees) of the following vector.v=12(cos(68°)i+sin(68°)j)
Question
Find the magnitude and direction angle (in degrees) of the following vector.
Vector:
v = 12(cos(68°)i + sin(68°)j)
- Magnitude:
- Direction Angle:
Solution
The magnitude of a vector v = ai + bj is given by √(a² + b²). In this case, a = 12cos(68°) and b = 12sin(68°).
Step 1: Calculate a² and b² a² = (12cos(68°))² b² = (12sin(68°))²
Step 2: Add a² and b² a² + b² = (12cos(68°))² + (12sin(68°))²
Step 3: Take the square root of the sum to find the magnitude |v| = √((12cos(68°))² + (12sin(68°))²)
However, we know that (cos(θ))² + (sin(θ))² = 1 for any angle θ. So, the magnitude of the vector is √(12²) = 12.
The direction angle of the vector is the same as the angle given in the vector, which is 68°.
So, the magnitude of the vector v is 12 and its direction angle is 68°.
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