physics q8

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Author:
tay
ID:
122845
Filename:
physics q8
Updated:
2011-12-11 19:29:06
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physics q8
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physics q8
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  1. a block rests on a 60 inclined plaine. the normal force that the plane exerts on the block is
    mgcos60
  2. if us=.6 and Uk=.4 about how much horizontal force is needed to start a 10kg blocking moving?
    60N
  3. in the previous problem about how much force is needed to keep the block moving at constant speed once it is in motion?
    40N
  4. no work is done on a particle that remains at rest
    false.
  5. only the net force acting on an object can do work
    false
  6. in the internation system of units, energy is measured in
    joules
  7. a 5n rock is raised slowly fromt he floor and placed on top of a 4m shelf. the work done to accomplish this is
    20j
  8. if the speed of a particle is doubled, the kinetic energy is
    doubled
  9. is it possible to exert a force that does work on an object witout increasing the kinetic energy of the object?
    yes

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