1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Three astronauts equipped with jetpacks

  1. Sep 29, 2013 #1
    Three astronauts equipped with jetpacks are pushing a satellite, having a mass of 121kg, through space. The forces being exerted on the satellite are F1=31.8N at an angle of 31.0 degrees above the horizontal (θ1), F2=40.0N at 60.2 degrees below the horizontal (θ2), and F3=54.7N along the horizontal.

    What is the magnitude of the satellite's acceleration?

    So I tried to solve it by adding all the FnetX, and Fnet Y

    Fnet x= 31.8 cos 31 + 54.7 + 40.0 cos 60.2
    = 27.2579 + 54.7 + 19.8789584
    = 101.8368786 N

    Fnet y= 31.8 sin 31 - 40.0 sin 60.2
    = 16.37821 - 34.71061813
    = -18.332408 N

    tan θ = 101.8368786 / -18.332408
    θ = -79.79506177

    sin θ = Fnet x/ Fnet
    sin (-79.79506177) = 101.8368786/ Fnet
    Fnet = -103.47 N

    Fnet = ma
    a = Fnet/m
    a = -103.4737987 N/121 kg
    a = -0.85 m/s^2

    But apparently it's wrong, can someone help please?
     
  2. jcsd
  3. Sep 29, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Did you include the minus sign in your answer? They wanted the magnitude of the acceleration.
     
  4. Sep 29, 2013 #3
    Yup i did, so i shouldn't enter the negative sign?
     
  5. Sep 29, 2013 #4

    Doc Al

    User Avatar

    Staff: Mentor

    No you shouldn't. Magnitudes are unsigned.
     
  6. Sep 29, 2013 #5
    It worked, thank you so much!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Three astronauts equipped with jetpacks
  1. Centrifugal astronaut (Replies: 10)

  2. Astronaut Momentum (Replies: 3)

  3. Astronaut Problem (Replies: 13)

  4. Astronaut weight (Replies: 2)

  5. Astronaut problem (Replies: 4)

Loading...