Homework Help Forum: Physics

Posted by Hannah on Thursday, October 22, 2009 at 11:26pm.

What is the work required to raise a 10. kg object from the surface of the Earth to a height of 2.0 m? 5.0 J 20. J 2.0 E2 J 2.0 E3 J My answer was 20. J but this was wrong. Is the answer 2.0 E2 J? A net force of 9.0 N acts through a distance of 3.0 m in a time of 3.0 s. The work done is? 3.0 J 9.0 J 27 J 81 J My answer was 9.0 J but again this was wrong. Is the answer 81 J?

• Physics - bobpursley, Friday, October 23, 2009 at 9:30am

  1) E=weight*h=10g*2=20g which is approx 196N so sthe best answer is 2.0E2 J 2) work=force*distance=9*3J

  
  

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