E=4i+3j A=5i finfd E.A=EAcos

Phonixor asked Dec 13, 2022

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Phonixor asked Dec 13, 2022

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13 votes

Answer:

theta = 36.87

Explanation:

E.A= (4i+3j).5i= 20

|E| |A| =

$| e| |a| = \sqrt{4 ^(2) + {3}^(2) } * 5 = 25$

$\cos(theta) = (e.a)/( |e ||a | ) = (20)/(25) = (4)/(5) \\ theta = \cos ^( - 1) ( {.8} ) = 36.87$

Balraj answered Dec 18, 2022

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