find-the-magnitude-and-direction-of-the-vector-r-3i-4j-to-the-nearest-degree-a-7N-143-0-b-5N-143-0-c-5N-127-0-d-7N-127-0-

Question Number 132116 by aurpeyz last updated on 11/Feb/21

f i n d t h e m a g n i t u d e a n d d i r e c t i o n o f

t h e v e c t o r r = 3 i - 4 j t o t h e n e a r e s t

d e g r e e

(a) 7 N 143^{0} (b) 5 N 143^{0} (c) 5 N 127^{0}

(d) 7 N 127^{0}

Answered by Olaf last updated on 11/Feb/21

∣ r ∣ = \sqrt{3^{2} + {(- 4)}^{2}} = 5

\arg r = \arctan (- \frac{4}{3}) \approx - 53 ° = 127 ° [180]

\Rightarrow (c)

Commented by aurpeyz last updated on 20/Mar/21

w h a t d o e s 127^{0} [180] m e a n s ?

i t h o u g h t i t s h o u l d b e 270 + 47 = 317^{0}

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