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: Math help 2 Questions

  1. Oct 3, 2005 #1
    1) A jet took 6h to fly against headwinds of 50 miles/hour from city A to B. It took 5H on the return trip when the winds became tailwinds of 50miles/hour. How fast does the jet travel relative to the air?

    2) The ammount of heat H which passes through wall "t" thick is proportional to the product of the area "A" of a wall T2 - T1, the differnce in temperature of the surfaces of the wall and is inversly proportional to "t". Express the equation and solve for T2.

    For #2 I got to: T2 = ((HT) / A) + T1

    Is that right? thanks.

    Thanks alot guys, been havinga lot of trouble with these.
  2. jcsd
  3. Oct 4, 2005 #2
    A distance one way is the same as on a way back (AB = BA).
    [distance] = [rate]*[time]
    (x-50)6 = (x+50)5

    You got it right! Why doubt?
    Just use "t" instead of "T":
    T2 = Ht / A + T1
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook