Knowee
Questions
Features
Study Tools

Let a⃗ =2i^+2j^+k^𝑎→=2𝑖^+2𝑗^+𝑘^ and b⃗ 𝑏→ be another vector such that a⃗ .b⃗ =14𝑎→.𝑏→=14 and a⃗ ×b⃗ =3i^+j^−8k^𝑎→×𝑏→=3𝑖^+𝑗^−8𝑘^ the vector b⃗ 𝑏→ =

Question

Let a=2i^+2j^+k^ \vec{a} = 2\hat{i} + 2\hat{j} + \hat{k} and b \vec{b} be another vector such that ab=14 \vec{a} \cdot \vec{b} = 14 and a×b=3i^+j^8k^ \vec{a} \times \vec{b} = 3\hat{i} + \hat{j} - 8\hat{k} the vector b \vec{b} =

🧐 Not the exact question you are looking for?Go ask a question

Solution

The vector b⃗ can be found using the formula for the dot product and the cross product.

The dot product of two vectors a⃗ and b⃗ is given by a⃗ .b⃗ = |a⃗||b⃗|cosθ, where |a⃗| and |b⃗| are the magnitudes of a⃗ and b⃗ respectively, and θ is the angle between them.

Given that a⃗ .b⃗ = 14, we can find |b⃗|cosθ = 14/|a⃗|.

The magnitude of a⃗ is √(2^2 + 2^2 + 1^2) = √9 = 3.

So, |b⃗|cosθ = 14/3.

The cross product of two vectors a⃗ and b⃗ is given by a⃗ ×b⃗ = |a⃗||b⃗|sinθn^, where n^ is the unit vector perpendicular to both a⃗ and b⃗.

Given that a⃗ ×b⃗ = 3i^+j^−8k^, we can find |b⃗|sinθ = √((3)^2 + (1)^2 + (-8)^2)/|a⃗| = √74/3.

Now, we know that |b⃗| = √((|b⃗|cosθ)^2 + (|b⃗|sinθ)^2) = √((14/3)^2 + (74/3)^2) = √(196+74)/3 = √90.

So, the vector b⃗ can be represented as b⃗ = |b⃗|(cosθi^ + sinθj^ + 0k^), where cosθ and sinθ can be found from the dot product and cross product respectively.

Please note that this is a general solution and the actual vector b⃗ will depend on the specific values of θ.

This problem has been solved

Similar Questions

Let a⃗ =2i^+2j^+k^𝑎→=2𝑖^+2𝑗^+𝑘^ and b⃗ 𝑏→ be another vector such that a⃗ .b⃗ =14𝑎→.𝑏→=14 and a⃗ ×b⃗ =3i^+j^−8k^𝑎→×𝑏→=3𝑖^+𝑗^−8𝑘^ the vector b⃗ 𝑏→ =

Find the value of 'a' if two vector A = 2i + aj +K & B = 4i - 3j + 2k are perpendicular to eachotherA. 20B. 15C. 10D. 5

The product of the magnitudes of two vectors A & B is 12. Scalar product of A & B is 6√3. Find the angle between A & B. When the scalar product will be zero

BEvaluate the dot product of the two vectors above. They are separated by an angle of 147° and have magnitudes given by:    Vector A: 8.00    Vector B: 10.0

Find the cross product a × b.a = 8, 0, −3,    b = 0, 8, 0⟨24,0,64⟩ Verify that it is orthogonal to both a and b.

1/1

Upgrade your grade with Knowee

Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.