Solving Wedge-like Problem with Physics

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The discussion revolves around calculating the force required to move a block using a cone, given the block's mass, friction factor, and contact area. The user is unsure about how to project the forces correctly, debating whether to project them on the cone's side or its surface normal. They propose a formula involving the friction force and the angle of the cone, but realize they overlooked the friction between the cone and the block. The conversation highlights the complexities of mechanics and the need for precise calculations in engineering problems. Assistance is sought to clarify the correct approach to this physics problem.
EugeneZ
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Hey, guys! Not really my homework question, I am long past my days of studying physics (I stumbled upon this problem doing some engineering researches) but still i put it here cause it should be rather easy. Here is the picture I made:
http://img248.imageshack.us/img248/7700/riddlew.png

Basically, I've got a block of a known mass, I know friction factor and contacting area, thus I am able to calculate Friction force being exerted upon moving this block. Block is being moved by a cone. I need to know a formula for a Force needed to be applied to a cone to move the block. Thank you very much!

P.S. As for my own efforts of solving, it comes down to this: I realize I have to project and equate projection of cone force to friction force but here it got a bit tricky for me. I'm very rusty in mechanics and I'm not really sure if i should project forces in this system on the side of the cone or on the surface normal of the cone side.
 
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Maybe I posted in the wrong forum?
 
C'mon guys
 
Well, I am not going to let it go that easy.
F=Ffriction*tan(alpha) or F=friction factor*block's mass*tan(alpha). Am I correct?

P.S. Oh gosh i just realized i totally missed friction between cone and block. :( Guys, I really need your help! Thank you in advance.
 
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Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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