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(a) Using the definition of the scalar product, find the angles between the following pairs of...

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Physics

(a) Using the definition of the scalar product, find the anglesbetween the following pairs of vectors.

A = 2 i + 3 kand B = - 3 i - 3j - 5 k    ___°
A = - 5 j and B= - 3 i - 4 j -k    ___°
A = 5 i + 5 jand B = 4 i + 4j + 2 k    ___°

(b) For A = 2 i +j - 3 k, B = - 2i + 5 j + 3 k,and C = 2 j - 3k, find C·(A -B) to three significant figures. ___

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