Recent content by Ojizo88

  1. O

    Heat required to melt an iceberg

    Youre using the wrong equation. Like has been stated, its a phase change and the formula would be Q = m L_{f} where L_{f} is the latent heat of fusion for water. IIRC its around 80 kcal/kg for water.
  2. O

    Heat equilibrium between two different rods

    Firstly, thank you for the assistance. I found out where the wrong step was. I figured it was something I was doing wrong algebraically. Secondly, I am sorry if I worded my statement improperly. I was trying to imply the fact that at the middle point, there is no NET heat flow that will...
  3. O

    Heat equilibrium between two different rods

    Well is the algebra at least correct? Because I've gone over that time and time again and can't find anything wrong. Maybe I am losing the forest in the threes though...
  4. O

    Heat equilibrium between two different rods

    Little bump before bed. Maybe someone can figure out what I am doing incorrectly :(
  5. O

    How Does Displacement Affect Momentum in a Frictionless Spring System?

    And don't worry about the negative -k that you come up with. Since values for k are always negative, a -k in an equation will actually be positive and youll get a positive energy value.
  6. O

    How Does Displacement Affect Momentum in a Frictionless Spring System?

    When the mass is all the way right ( or left ) you have the relationship that PE+KE=0. So, 1/2kx²+1/2mv²=0. Now you can solve for v in terms of x and thusly write p in terms of x also.
  7. O

    Does Distance Affect Angular Velocity and Tangential Velocity on Earth?

    Ironic :wink:
  8. O

    A projectile equation, and then some

    Solve for the time it takes a projectile to drop 2m. Now, you should know a distance they traveled horizontally in a certain amount of time... You should be able to take it from there. Ill check back again later.
  9. O

    Does Distance Affect Angular Velocity and Tangential Velocity on Earth?

    Im a little unsure of the question, but... Angular velocity has nothing to do with the radius of ( or distance from ) the earth. Its purely how many times something is rotating per unit time. Tangential velocity does depend on distance and you need only to think about it. If I want to make...
  10. O

    Angular Momentum of a sanding disk

    If you can find its angular acceleration, then ( just like linear kinematics... ) its angular velocity is equal to its angular acceleration multiplied by the duration of the acceleration.
  11. O

    Angular Momentum of a sanding disk

    lol man I stared at that over and over again and thought, "I must be misreading this...wheres the trick?" But seriously, yes you are given the time. its "33.0ms" part
  12. O

    How Does Displacement Affect Momentum in a Frictionless Spring System?

    Ah, and I forgot, when you displace the spring distance x, and you have PE of 1/2kx², this will be your KE @ 0 which will be 1/2mv² so you can relate x to v which you can relate to p
  13. O

    How Does Displacement Affect Momentum in a Frictionless Spring System?

    Magnitude is directly related to velocity. If a mass is oscillating back and forth, where is velocity the greatest? Well, starting at the right hand +x side, V_{1} = 0. When it reaches its maximum on the -x side, V_{2} = 0 as well. So, this means that velocity will be at a maximum when the...
  14. O

    Heat equilibrium between two different rods

    [SOLVED] Heat equilibrium between two different rods Homework Statement A rod 1.3 m long consists of a 0.8 m length of Aluminium joined end-to-end to a 0.5 m length of brass. The free end of the aluminium section is maintained at 150 oC and the free end of the brass piece is maintained at...