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  • As we know, Snow White's step-mother gave Snow White a poisonous apple, Snow White is almost died. At this time, the Prince Charming come and kiss the Snow White. Snow White wake up. Than they are fall in love with each other.
  • •They get married, and ask the bad step-mother leave their imperial palace. They have a happy life.
  • The witch is very angry.
  • I will kill you Snow White, I am the most beautiful woman in the world not you! I hate you.
  • Now we need to save my wife Snow White, so I ask you come to help me. The weight of Snow White is 40kg, we need to come to the Witch's house and Snow White crawl down the building(is 20m) use our rope, we just need to hold the rope.. We need to calculate how mach work we need to be done.
  • What is Work? How to calculate it?
  • Work is the transfer of energy to an object to move in direction by using a force. W=F*D, the unit is J.
  • Just now I calculate we need W=40kg*(-9.81m/s²)*20m=7848J.
  • It is about 2 minutes, T=W/P=7848/65.4=120s.
  • Please calculate how long should we need, if the Power is 65.4W. Power is how fast the Work is done. P=W/T.
  • What is K.E. and P.E.? How to calculate?
  • Now the P.E. for Snow White is 7848J, the K.E. is 0J. When she come down the P.E. is oJ, the K.E. is 7848J. We should protect Snow White.
  • P.E.+K.E.=Mechanical energy. The energy will be Conservation of energy. P.E. is store energy, K.E. is the energy of motion.
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