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March 26, 2015

March 26, 2015

Posted by **Student** on Sunday, October 7, 2007 at 1:43pm.

well so far i THINK that since the rock is stuck between a wedge, the Fn would be 3.6, and since Fs = .86(3.6) = 3.096. And I see that since Fc = (mv^2)/ r, and this would mean that r = (mv^2) / Fc. The mass is .003 kg, and v = 10m/s.. Im having trouble finding Fc

- Physics -
**Student**, Sunday, October 7, 2007 at 2:04pmwell apparently fc = fs, and i got fs as 3.096 as correct...but then that means that r = (.003 * 100)/ 3.096 which is .096889m..this doesn't make sense

- Physics -
**bobpursley**, Sunday, October 7, 2007 at 2:43pmOne could approach it logically,

the centripetal force=force friction

m v^2 /r = 2*Fn*mu

solve for r

Now notice the 2 on the right. That is because you have friction working form Fn holding each side.

The solution for r indicates it is about 5 cm, a very small wheel for an automobile.

- Physics -
**Student**, Sunday, October 7, 2007 at 3:46pmActually the answer i put up was correct. I was just shocked because the wheel seemed to be so small..but i guess the numbers made it true

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