How to Calculate Force of Water in Rotating Pail | Physics Problem

[nrc_8706]

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 don't know what to do next?

 

[johnw188]

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 don't 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

\sum F = ma

 

[nrc_8706]

?

normal force is upward and weight is downward

Fnet=Fn-mg?

 

[nrc_8706]

Help!

CAN ANYBODY HELP ME?!

 

[stuplato]

CAN ANYBODY HELP ME?!

the water exerts two forces onto the pail... can you name them?

 

[nrc_8706]

its weight and...

 

[stuplato]

Centripital Force

 

[nrc_8706]

...

ok so its F=4mg or F=2mg?

 

[stuplato]

Centripital force is defined by equation:

Fc = (m*v^2)/r

 

[nrc_8706]

gracias

thanks for everything but I am just not understanding

 

[stuplato]

What is your current curriculum/topic in class?

 

[nrc_8706]

Dynamics Of Uniform Circular Motion