Recent content by cstout

  1. C

    Find the Mass of Ice Needed to Cool 800mL Water to 0.0°C

    ok, but now how do you find how much ice is needed? when density = mass/v and the density of water is 1000kg/m^3 =mass / 800mL
  2. C

    Find the Mass of Ice Needed to Cool 800mL Water to 0.0°C

    Homework Statement Ice at 0.0°C is mixed with 8 × 102 mL of water at 28°C. How much ice must melt to lower the water temperature to 0.0°C? Homework Equations Q = mc(delta)T The Attempt at a Solution c = 4.184 J/g K (delta)T = -28C V = 800 mL I'm not sure what to do since...
  3. C

    How Much Space Does 0.736 kg of Oxygen Occupy at 1°C and 105 Pa?

    ahh..thanks, i got it now
  4. C

    How Much Space Does 0.736 kg of Oxygen Occupy at 1°C and 105 Pa?

    so would i multiply the mass of .736(1000)32 to find the n, or basically i still am unsure of finding the n
  5. C

    How Much Space Does 0.736 kg of Oxygen Occupy at 1°C and 105 Pa?

    Homework Statement A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy? Homework Equations PV=nRT V=nRT/P The Attempt at a Solution n=(.736)(1000)/16 = 46 V =...
  6. C

    How Do You Calculate Young's Modulus from Wire Stretching Data?

    ah.. thanks i got it now
  7. C

    How Do You Calculate Young's Modulus from Wire Stretching Data?

    Homework Statement A wire of length 4.97 m with a cross-sectional area of 0.104 cm2 stretches by 6.52 mm when a load of 0.92 kN is hung from it. What is the Young's modulus for this wire? Answer in Pa Homework Equations F/A = Y(Change in L / L) where F is the magnitude of force A =...
  8. C

    Calculating Torque for LP Turntable with Given Angular Speed and Mass

    Ok, so the Time = Distance / Average Speed, the distance is 11.932 radians, but what is the average speed, is it simply the given speed of 3.53 or something else?
  9. C

    Calculating Torque for LP Turntable with Given Angular Speed and Mass

    oh yea, sorry, change in velocity / change in time
  10. C

    Calculating Torque for LP Turntable with Given Angular Speed and Mass

    change in distance / change in time
  11. C

    Calculating Torque for LP Turntable with Given Angular Speed and Mass

    Homework Statement An LP turntable must spin at 3.53 rad/s to play a record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.9 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.7 cm and mass 0.24 kg. Homework...
  12. C

    How Fast Does a Spinning Disk Rotate After One Full Revolution?

    Homework Statement A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at theta 0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference...
  13. C

    Solving Firework Explosion Homework Problem

    so does Pi = 260(mass) and Pf = mass(velocity) so the masses cancel and the velocity is 260?
  14. C

    Solving Firework Explosion Homework Problem

    Homework Statement A firecracker is tossed straight up into the air. It explodes into three pieces of equal mass just as it reaches the highest point. Two pieces move off at 130 m/s at right angles to each other. How fast is the third piece moving? Homework Equations The Attempt...
  15. C

    Find the Ratio of Recoil Velocities: Blank vs Standard Cartridge

    what would you use to find the recoil speeds then?