# Homework Help: Help Plz

1. Apr 8, 2005

### vibu505

http://img156.exs.cx/img156/3825/22ls.jpg

Heya!

I just need a kick start on those questions means just which equations to use. Ty for any help! :tongue2:

2. Apr 8, 2005

### xanthym

SOLUTION HINTS:
#8:
Since there is no friction and no other forces acting on the bead in its direction of motion, Conservation of Energy can be used:
{Initial Total Energy} = {Total Energy at Point A}
::: ⇒ {Initial Kinetic Energy} + {Initial Potential Energy} =
= {Point A Kinetic Energy} + {Point A Potential Energy}
::: ⇒ {0} + {m*g*h} = {(1/2)*m*v2} + {m*g*(2*R)}
Solve above equation for "v".
Then the total Centripetal Force on the Bead at Point A will be "{m*v2/R}".

#10:
Use Conservation of Momentum applied to the System of 2 persons:
{Initial Momentum} = {Final Momentum}
::: ⇒ {0} = (mperson_1)*(vperson_1) + (mperson_2)*(vperson_2)
Solve for the ratio "(mperson_2)/(mperson_1)".

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Last edited: Apr 8, 2005
3. Apr 8, 2005

### naren11

ty soo much!!

of couse #8 was but tough but hmm it seems 10 is simple! :p