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Units and Dimensions

If L,M,N are ...

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If L,M,N are physical quantities with different dimensions, then which of the following combinations can never be meaningful quantity? (1.) LM/N (2.) LN - M (3.) LN - M^2/N (4.) L - M/N

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Q. In ∆LMN, m∠M = 40°, m∠N = 50°. Which of the following statements is true?

(1) [l (MN)]² = [l (LM)]² + [l (LN)]²
(2) [l (LM)]² = [l (MN)]² + [l (LN)]²
(3) [l (LN)]² = [l (LM)]² + [l (MN)]²

l^{2} + m^{2} + n^{2} = 5

(l m + m n + l n)

l^{2} + m^{2} + n^{2} = 5,

(l m + m n + l n)

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