Help needed for physics question!

• unclebutcher

  1 Jul 07, 20:36

  its a level standard if i'm not wrong. ts u jc2 issit
• unclebutcher

  1 Jul 07, 20:38

  ts. let me go and work it out. if i know i will have an answer by tmr morning if not then im sorry
• Uncertain

  1 Jul 07, 20:43

  Originally posted by WoBuPaNi:

  need help on another question
  
  An engine is used to pull a train of two cars out of a mine. The floor slopes upward at an angle of 22 degrees. Each car has a mass of 1.2x104 Kg and normally travels without friction on the tracks. The engine can exert a maximum force of 0.9x105 N on car A.
  If the engineer again throttles back so that the force exerted by the engine on car A decreases at the constant rate of 3.3 N per second, how long before the train stoprs moving up the track?
  Assume the original speed was 2.8 m/s

  U sure no prob in ur question a not? i seriously confused by this qn of urs. first is the mass 1.2 x 104 or 1.2 x 10^4? then the engine throttle back or the engineer? Then got 2 cars but then u only say car A then where is the other car? how are they linked?
• eagle

  1 Jul 07, 20:58

  Certain information pertaining to the initial force is missing
• unclebutcher

  2 Jul 07, 12:12

  i dont know how to do this question.
• WoBuPaNi

  2 Jul 07, 12:44

  Originally posted by Uncertain:

  U sure no prob in ur question a not? i seriously confused by this qn of urs. first is the mass 1.2 x 104 or 1.2 x 10^4? then the engine throttle back or the engineer? Then got 2 cars but then u only say car A then where is the other car? how are they linked?

  engine throttles back.. Each carhas a mass of 1.2x104 Kg and normally travels without friction on the tracks
• Uncertain

  2 Jul 07, 17:24

  .........
  
  1) 1.2 x 104 = 124.8
  
  2) 1.2 x 10^4 = 12000
  
  Which value is the one ask in the qn? 1) or 2)