Rotaty motion

What is the minimum speed and frequency that we need to rotate with water can in a vertical plane along a circle with a radius of 70 cm to prevent water from spilling?

Result

v =  2.646 m/s
f =  0.602 Hz

Solution:

r=70 cm=70/100 m=0.7 m g=10 m/s2 Fg=Fo mg=mv2r g=v2r  v=r⋅ g=0.7⋅ 10≐7≐2.6458≐2.646 m/s  ω=v/r=2.6458/0.7≐3.7796 1/radr=70 \ cm=70 / 100 \ m=0.7 \ m \ \\ g=10 \ \text{m/s}^2 \ \\ F_g=F_o \ \\ m g=\dfrac{ mv^2 }{ r } \ \\ g=\dfrac{ v^2 }{ r } \ \\ \ \\ v=\sqrt{ r \cdot \ g }=\sqrt{ 0.7 \cdot \ 10 } \doteq \sqrt{ 7 } \doteq 2.6458 \doteq 2.646 \ \text{m/s} \ \\ \ \\ ω=v/r=2.6458/0.7 \doteq 3.7796 \ 1\text{/rad}
ω=2 πf  f=ω2π=3.77962⋅ 3.1416≐0.6015≐0.602 Hzω=2 \ \pi f \ \\ \ \\ f=\dfrac{ ω }{ 2 \pi }=\dfrac{ 3.7796 }{ 2 \cdot \ 3.1416 } \doteq 0.6015 \doteq 0.602 \ \text{Hz}

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