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alexyn Group Title

A child pulls a 15-kg sled containing a 5.0-kg dog along a straight path on a horizontal surface. He exerts a force of 55 N on the sled at an angle of 20° above the horizontal, as shown in the figure above. The coefficient of friction between the sled and the surface is 0.22. a. Calculate the normal force of the surface on the system. b. Calculate the acceleration of the system. c. Calculate the work done by the child's pulling force as the system moves a distance of 7.0 m

  • 2 years ago
  • 2 years ago

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  1. alexyn Group Title
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    d. At some later time, the dog rolls off the side of the sled. The child continues to pull with the same force. On the axes below, sketch a graph of speed, v, versus time, t, for the sled. Include both the sled's travel with and without the dog on the sled. Clearly indicate with the symbol tr the time at which the dog rolls off.

    • 2 years ago
  2. ksaimouli Group Title
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    can u do me a favor can u draw the diagram

    • 2 years ago
  3. alexyn Group Title
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    sure

    • 2 years ago
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  4. ksaimouli Group Title
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    what part u r struck

    • 2 years ago
  5. ksaimouli Group Title
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    ok so (a) FN=mg-Fsin 20

    • 2 years ago
  6. alexyn Group Title
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    Part D

    • 2 years ago
  7. ksaimouli Group Title
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    i am sorry i am weak at graphs :-(

    • 2 years ago
  8. ksaimouli Group Title
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    @ivanmlerner can u help her please

    • 2 years ago
  9. alexyn Group Title
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    thanks for trying though

    • 2 years ago
  10. ivanmlerner Group Title
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    It is only in part d that you need help?

    • 2 years ago
  11. alexyn Group Title
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    yes. please

    • 2 years ago
  12. ivanmlerner Group Title
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    Ok, you know the aceleration before the dog jumps out, so you can draw the graph of v until that moment by using the aceleration as the slope of the line because it is the rate of change of the velocity. Do you understand it so far?

    • 2 years ago
  13. alexyn Group Title
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    Yes.

    • 2 years ago
  14. alexyn Group Title
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    Im unsure about the acceleration. I got 0.07 m/s. Is that right?

    • 2 years ago
  15. ivanmlerner Group Title
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    Just to be sure, what number are you considering for g?

    • 2 years ago
  16. ivanmlerner Group Title
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    10 or 9.8?

    • 2 years ago
  17. ivanmlerner Group Title
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    I'll be back in a few minutes but I got 0.43 with 9.8

    • 2 years ago
  18. alexyn Group Title
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    -10

    • 2 years ago
  19. alexyn Group Title
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    ok. I got 1.64 m/s now

    • 2 years ago
  20. furnessj Group Title
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    So, I had a go at this, I get a) 177.4N b) 0.63 m/s/s c) 362J As for d) - the question says to sketch, so you do not need values. You just need to realise that with less mass but the same force, the acceleration will be greater, so the slope must get steeper: |dw:1352244868726:dw|

    • 2 years ago
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