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

Mathematics

1 answer:

Luba_88 [7]3 years ago

4 0

Answer:

theta = 36.87

Step-by-step explanation:

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

|E| |A| =

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

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

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