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snow_tiger [21]
2 years ago
10

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

Mathematics
1 answer:
Luba_88 [7]2 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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