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Ex 10.2, 1 - Chapter 10 Class 12 Vector Algebra
Last updated at April 16, 2024 by Teachoo
Multiplication of a vector by a scalar
Chapter 10 Class 12 Vector Algebra
Concept wise
- Scalar or vector
- Graphical displacement
- Type of vector
-
Multiplication of a vector by a scalar
- Equal vectors
- Unit vector
- Direction cosines and ratios
- Addition(resultant) of vectors
- Joining two points
- Section formula
- Right Angled triangle
- Collinearity Of two vectors
- Collinearity of 3 points or 3 position vectors
- Scalar product - Defination
- Scalar product - Projection
- Scalar product - Solving
- Vector product - Defination
- Vector product - Area
- Vector product - Solving
Transcript
Ex 10.2, 1 Compute the magnitude of the following vectors: 𝑎 ⃗ = 𝑖 ̂ + 𝑗 ̂ + 𝑘 ̂, 𝑏 ⃗= 2𝑖 ̂ − 7𝑗 ̂ – 3𝑘 ̂, 𝑐 ⃗ = 1/√3 𝑖 ̂ + 1/√3 𝑗 ̂ − 1/√3 𝑘 ̂𝑎 ⃗ = 𝑖 ̂ + 𝑗 ̂ + 𝑘 ̂ = 1𝑖 ̂ + 1𝑗 ̂ + 1𝑘 ̂ Magnitude of 𝑎 ⃗ = √(12+12+12) |𝑎 ⃗ | = √3 ∴ Magnitude of 𝑎 ⃗ = √3 𝑏 ⃗ = 2𝑖 ̂ – 7𝑗 ̂ – 3𝑘 ̂ Magnitude of 𝑏 ⃗ = √(22+(−7)2+(−3)2) |𝑏 ⃗ | = √(4+49+9) = √62 ∴ Magnitude of 𝑏 ⃗ = √62 𝑐 ⃗ = 1/√3 𝑖 ̂ + 1/√3 𝑗 ̂ − 1/√3 𝑘 ̂ Magnitude of 𝑐 ⃗ = √((1/√3)^2+(1/√3)^2+((−1)/√3)^2 ) |𝑐 ⃗ | = √(1/3+1/3+1/3) = √(3/3) = √1 = 1 ∴ Magnitude of 𝑐 ⃗ = 1
