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Pail homework problem

  • Thread starter nrc_8706
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  • #1
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a pail of water is rotated in a vertical circle of r=1.4m acceleration of gravity 9.8m/s^2

the pail is rotated at a constant rate so it has the minimum speed at all points along its circular path. the water has a mass m.
when the pail is at the bottom of the circle, what is the magnitude of the force exerted by the water on the bottom of the pail?

F=ma=0 since it is at a constant rate right?

but then i dont know what to do next?
 

Answers and Replies

  • #2
20
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nrc_8706 said:
a pail of water is rotated in a vertical circle of r=1.4m acceleration of gravity 9.8m/s^2
the pail is rotated at a constant rate so it has the minimum speed at all points along its circular path. the water has a mass m.
when the pail is at the bottom of the circle, what is the magnitude of the force exerted by the water on the bottom of the pail?
F=ma=0 since it is at a constant rate right?
but then i dont know what to do next?
Nay! Draw out your free body diagrams, that should help.

Also, I notice a lot of people making this mistake. Saying F = ma is rarely true. Always remember to add your sigma

[tex]\sum F = ma[/tex]
 
  • #3
71
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?

normal force is upward and weight is downward

Fnet=Fn-mg?
 
  • #4
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Help!!!!

CAN ANYBODY HELP ME?!!!!!:cry:
 
  • #5
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nrc_8706 said:
CAN ANYBODY HELP ME?!!!!!:cry:
the water exerts two forces onto the pail... can you name them?
 
  • #6
71
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:confused: its weight and........:confused:
 
  • #7
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Centripital Force
 
  • #8
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....

ok so its F=4mg or F=2mg?
 
  • #9
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Centripital force is defined by equation:

Fc = (m*v^2)/r
 
  • #10
71
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gracias

:uhh: thanks for everything but im just not understanding
 
  • #11
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What is your current curriculum/topic in class?
 
  • #12
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Dynamics Of Uniform Circular Motion
 

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