Question

If P and Q are two vectors and the angle between them is 270°, then how much is the magnitude of their scalar product ?

Answer 1

Answer:

as we kon for two vectors P and Q

P.Q = |P||Q|costheeta.

as here theeta = 270°

cos270°= 0

So,P.Q = 0.

Answer 2

Answer:

Given: P and Q are two vectors and the angle between them is 270°

To find: The magnitude of their scalar product

• The scalar product of two vectors is defined as the product of the magnitudes of the two vectors and the cosine of the angles between them.
• Scalar product of 2 vectors = (P)(Q)cosθ
• PQ cos(270)     [cos(270) = cos(180 + 90) = cos90 = 0]
• PQ(0)
• 0

∴We get the magnitude of their scalar product as 0

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