A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Calc Question: Force 1 = 70 lbs Force 2 = 100 lbs Resultant = 80 lbs What is the angle between the forces given the resultant force is the magnitude.

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    dot product 80 = 70*100*cos(theta) cos(theta) = 8/700 theta is around 89.35 degrees

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I have seen similar problems worked this way, but the book yields the answer as 53 degrees. Any thoughts?

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    70^2 + 100^2 + 2(70)(100)cos(theta) = 80^2 14000cos(theta) = -8500 cos(theta) = -17/28 theta = 127.383 adjust for negative 53

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ^-- law of cosine

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry for mistake :x

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Excuse my unintelligent moment...but may I inquire on how you got the -8500.

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    80^2 - 70^2 - 100^2 = -8500 i moved all numbers to right side

  8. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    AH! Alright. Thanks for the help *Medal Given*

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol thanks and no problem

  10. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.