Recent content by map7s

  1. M

    Heat and adiabatic processes perhaps

    Is there a certain equation that I am supposed to use?
  2. M

    Heat and adiabatic processes perhaps

    You have two cups, one with m1 = 2.73 kg of water at t1 = 42.32oC and the other with m2 = 1.88 kg at t2 = 21.34oC. You mix the two in an insulated thermos. What is the final temperature of the water? I'm pretty sure that this is supposed to be an adiabatic process, because you are trying to...
  3. M

    Ideal Gas Law: Calculating Pressure and Moles of Helium Gas

    actually, I double checked my work again and found out that I had accidentally miskeyed a number into my calculator...thanks so much though! It helped to talk it out!
  4. M

    Ideal Gas Law: Calculating Pressure and Moles of Helium Gas

    ideal gas law...I think... Homework Statement Useful Constants: 1 Torr = 133.32 Pa; R = 8.3145 J/mol·K You have a thin metal sphere of unknown volume that contains helium gas at low pressure. You put the entire metal sphere into a bath of liquid nitrogen, and a pressure gauge on the...
  5. M

    Chem Lab Titration: Finding Unknown Molarities

    We recently did an experiment in chem lab with titrations and we are supposed to find out the molarities of some unknown solutions. I thought that I was doing my calculations right, but the checking program that I am using keeps telling me that I am wrong. We made a standard solution that was...
  6. M

    Rotational Energy: Angular Acceleration, Speed, Radians & Kinetic Energy

    the other parts of the question are: e) What is the kinetic energy of the rotating disks at this time? f) Let the zero of the gravitational potential energy be zero when the mass is released at rest. What is the gravitational potential energy of the dropping mass at 6.04 s? g) What is the...
  7. M

    Rotational Energy: Angular Acceleration, Speed, Radians & Kinetic Energy

    i did get the linear velocity correct, but it is telling me that my calculation of the linear kinetic energy is wrong...is there any other way to go about doing this part of the problem ?
  8. M

    Solving Mass of 2nd Disk with Angular Momentum

    oh...okay...thank you so much!
  9. M

    Solving Mass of 2nd Disk with Angular Momentum

    okay... so I set it up as Iw=Iw...number-wise it's 1/2 mr^2*w= 1/2 mr^2*w...or 1/2(2.74)(1)^2(61.1)=1/2(2.74+x)(2)^2(24.7)...but the answer that I am getting for 2.74+x is not larger than 2.74...so if I subtract it, I will get a negative number...what am I doing wrong?
  10. M

    Solving Mass of 2nd Disk with Angular Momentum

    okay...so where would I incorporate g if angular momentum = Iw^2 ?
  11. M

    Solving Mass of 2nd Disk with Angular Momentum

    Homework Statement NOTE: Use g=9.809 m/s^2 A solid disk of radius R and mass 2.74 kg is spinning at angular velocity 61.1 rpm about a vertical axis. A solid disk of radius 2R drops concentrically on the first (sort of like dropping an old-fashioned 33 rpm record on a 45 rpm one), so that...
  12. M

    Rotational Energy: Angular Acceleration, Speed, Radians & Kinetic Energy

    Homework Statement A mass of 20 g is tied to one end of a thin thread. The other end is wrapped around a small cylinder of radius 0.01252 m. The small cylinder is attached to a much heavier aluminum disk. You calculated the rotational inertia of the aluminum disk in a previous problem in...
  13. M

    Mechanical Energy of 56.9kg Exercise Machine in 71.2m Hall

    oh...okay...that actually makes sense now...thank you so much! that was really helpful!
  14. M

    Mechanical Energy of 56.9kg Exercise Machine in 71.2m Hall

    okay...that makes more sense...so in the equation W=Fd, for F, would I use ma where a=g? and then take that F value and subtract the force of friction from it and then multiply it by the distance?
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