anonymous
  • anonymous
Hi, i ask this the other day and if someone can solve it with answer and explains, will fan and medal: When a beam makes an angle of 40 degrees with the ground, the top of the beam is 8 feet above the ground. There a telephone wires near by and the worker worried that the beam may hit the wires. When the beam makes a angle of 60 degrees with the ground, the wires are 2 feet above the beam. Will the beam hit the ground if the crew continues to raise it?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@radar
anonymous
  • anonymous
I almost have the answers, i think?! call L is the hypotenuse of the figure: Sin 40 degree=8ft/L L=8ft/(Sin^ 40 )≈ 12.45 Call h is the lenght from thr beam to the ground at angle 60 degre: Sin 60=h/12.45 h=12.45(Sin 60) ≈ 10,78ft
danica518
  • danica518
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More answers

anonymous
  • anonymous
the teacher hints me that the beam WILL NOT hit the wires but I don't know how to prove it
danica518
  • danica518
okay so you see the height at 60 degrees is at 10.78 right
danica518
  • danica518
|dw:1439959659391:dw|
anonymous
  • anonymous
yes
danica518
  • danica518
the wires at 2 feet about that so 10.78+2 = 12.78 feet and when the whole beam is put vertically that means the whole hypotenuse is on the vertical the height of the hypotenuse is 12.45 so it cant hit it
danica518
  • danica518
|dw:1439959743746:dw|
danica518
  • danica518
|dw:1439959797689:dw|
danica518
  • danica518
make sense?
anonymous
  • anonymous
yes :) thank you, can you help me with 1 more? I'll post it after this :) please?
danica518
  • danica518
ok
danica518
  • danica518
sure

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