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Author Question: A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the ... (Read 311 times)

RODY.ELKHALIL

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on: Jul 29, 2018
A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward.
 
  At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8
  B) 27.7
  C) 30
  D) 34.5
  E) 45

Question 2

The absorption of an infrared photon that excites an atom to emit a green photon
 
  A) occurs in plants.
  B) occurs in the process of phosphorescence.
  C) would violate the law of energy conservation.
  D) all of the above
  E) none of the above


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shailee

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

Answer: C


RODY.ELKHALIL

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Reply #2 on: Jul 29, 2018
Thanks


shailee

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Reply #3 on: Jul 29, 2018
Welcome :)


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