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ID#5747 HSC Physics 1st MCQ (Sylhet 2025)

A = 2i + 2j - k এর উপর B = 6i - 3j + 2k এর লম্ব অভিক্ষেপের মান কত?
ক) 3.33
খ) 2.33
গ) 1.33
ঘ) 0.33

ব্যাখ্যা

অভিক্ষেপ $k = \frac{\vec{A} \cdot \vec{B}}{|\vec{A}|}$
$\vec{A} \cdot \vec{B} = (2 \times 6) + (2 \times -3) + (-1 \times 2) = 12 - 6 - 2 = 4$
$|\vec{A}| = \sqrt{2^2 + 2^2 + (-1)^2} = 3$
অভিক্ষেপ $= 4/3 = 1.33$
Resource Details
Exam HSC
Subject Physics 1st paper
Chapter 2
Board Sylhet
Year 2025

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