Recent content by JinFTW

  1. J

    Calculating Voltage Change in a Voltage Divider Circuit

    Homework Statement Consider the following voltage divider circuit with these values: R1= 10.0 kΩ, R3= 15.0 kΩ, E1= 13.0 V. What is the percent change in Vx when we connect a load resistor Rx = 10 R3? http://a.imageshack.us/img25/1546/circuity.th.png Homework Equations V1 = E * R3...
  2. J

    How Long Will a Rocket with Time-Dependent Thrust Stay Airborne on Mars?

    Not sure if this is the final answer or not, but for time I have (10s + 4.06s) = 14.06s. I also am trying to figure out how Yf = 1810 (if it does), even though I understand how you got your equations, I've never seen a problem similar to this where we don't have to find where Vf = 0 (top of the...
  3. J

    Compound pulley tension question

    Hey guys I have a problem I got wrong similar to this. The pulley set up is exactly the same, but the outside rope is pulled at an angle (60) and I was curious to see how the force changes with the angle. Don't get me wrong here, I know that to find the x component of the force it would be...
  4. J

    How Long Will a Rocket with Time-Dependent Thrust Stay Airborne on Mars?

    Thank you very much for the help, but I was just curious, I can see how you got the equations to get Vf for the first part of the rocket's trip. What I'm curious about is the last part of your equation. Are you saying that this rocket doesn't keep going after thrust ends? I know I've done a...
  5. J

    How Long Will a Rocket with Time-Dependent Thrust Stay Airborne on Mars?

    Sorry guys just read the rules: Ok so I started this problem by using F = T (thrust) - mg (weight) = ma Since m = 2 this means that I simply have to plug in t into the Thrust equation to get the force of the thrust. for example under 1 second it's: F = 120 - 2(3.8) = 2a which means...
  6. J

    How Long Will a Rocket with Time-Dependent Thrust Stay Airborne on Mars?

    Hey guys, I just joined the forum and I hate to bother you with this, but after working on my HW questions for awhile I've found one that has completely killed my brain. No matter what I do I cannot get an answer that seems suitable to what the question is asking. Any help on this would be...
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