Monday, September 29, 2014

Implosions and Explosions



***DON'T FORGET YOUR ART HOMEWORK- DO IT AND BRING IT!

1. Thursday's class:  we will begin  with a game of Twenty Questions --yes/no questions about the tanker--you be the detective to figure out what caused the implosion.  Yes, it was an accident. Someone was just not thinking!
Think of a few questions and write them in your SJs




2. Comic Strip explaining the sequence of events as we heated the water in the cola can and then plunged it into ice water.  5 Panel minimum, and show the  regular air particles as O's and the steam as X's. Use arrows ---> to represent Pressure.  Remember to put the  particles both in and out of the can, and to consider temperature and pressure changes as well what happens when stuff is heated or suddenly cooled. And also  consider the phase changes (liquid>steam or steam>liquid)

  1. can with liquid water in the bottom and air particles above, also the particles outside the can
  2. heat added, what changes inside and out
  3. more heat added, more changes
  4. can on its way into the ice-water bath
  5. can collapsing
and always show what the particles are doing, both in and out of the can, as well as the pressure, both in and outside the can.

3.  Math Moment! You will need a soda can for this>>figure out the total air pressure on the outside of the can.      this is how:
  • find the surface area of the can (cylinder) in inches 
  • tutorial  here https://www.youtube.com/watch?v=gi7aaZ87EoQ
  • multiply the surface area  by 14.7 pounds per square inch. (This is the atmospheric pressure at sea level).
  • This is the total pressure on the outside of the can in pounds.
  • Show your work in your SJ.

4. 28-minute video: Modeling the Unseen you will need to click on the VOD button for #4 probably twice

*******Purple highlights are the checklist of homework to be done.**************

Just for the fun of it: EXPLOSIONS!!!

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