Posted by Anonymous on .
you swing the pail in a vertical circle of radius 0.900m.What minimum speed must you give the pail at the highest point of the circle if no water is to spill from it?

Physics 
bobpursley,
well, centripetal force must be greater than weight
mg<=mv^2/r
v>=sqrt(g*r)
check that. 
Physics 
Anonymous,
i don't know where to go from there

Physics 
bobpursley,
v is the minimum speed.

Physics 
Young J. Hong,
Consider the following equation in the ydirection.
Fy=T+Fg=ma
Or in this case...
T+Fg=(mv^2)/R
Tension equals to 0 because when the pail of water is at the highest point, tension is nonexistent.
Therefore...
mg=(mv^2)/R
Cancel out mass
g=(v^2)/R
(Rg)^(1/2)=v
Plug in values.