1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Waves & SHM, HELP

  1. Jan 28, 2009 #1
    1. The problem statement, all variables and given/known data

    To measure the acceleration due to gravity on a distant planet, an astronaut hangs a 0.060-kg ball from the end of a wire. The wire has a length of 1.5 m and a linear density of 3.1 multiplied by 10-4 kg/m. Using electronic equipment, the astronaut measures the time for a transverse pulse to travel the length of the wire and obtains a value of 0.098 s. The mass of the wire is negligible compared to the mass of the ball. Determine the acceleration due to gravity.

    m=.06 kg
    linear density= 3.1 multiplied by 10-4 kg/m
    t(time)=0.098 s

    2. Relevant equations
    v=√ F/linear density

    3. The attempt at a solution

    v=1.5 x .098

    v=√ F/linear density
    .147=√ F/3.1 multiplied by 10-4 kg/m
    .0216=F/3.1 multiplied by 10-4 kg/m
    .0216 x 3.1 multiplied by 10-4 kg/m=F
    F= 6.699e-6

    6.699e-6=.06 kg x a

    my answer was WRONG!
  2. jcsd
  3. Jan 28, 2009 #2
    Well, in your Relevant Equations you state that v=d/t (which is correct) but in the first step of your solution you seem to use v=d*t.

    It might just be as simple as that.
  4. Jan 28, 2009 #3
    Wow, thank you sooooo much, its funny how little mistakes can make a mess out of a problem!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook