anonymous
  • anonymous
the resultant of two forces 3N and 4N making an angle 90 with each other is a) 1N b) 7N c) 5N d) 3.5N
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
the answer would be 5N apply this formula for resultant \[\sqrt{A ^{2}+B ^{2}+2AB \cos \theta}\] cos90=0 so, \[\sqrt{4^{2}+3^{2}}=\sqrt{16+9}=\sqrt{25}=5\]
anonymous
  • anonymous
is it correct equation?
anonymous
  • anonymous
they are at 90 degree with each other. why is not sin theta in place of cos theta?

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anonymous
  • anonymous
i am not quite sure about answer!you can ask someone who is confirmed about it.
anonymous
  • anonymous
you can take it as forula,if you ever want to calculate the resultant of two vectors,this formula is used

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