Law of conservation of enegry and one task

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The discussion centers on applying the law of conservation of energy to a physics problem involving a washer sliding on ice. The washer impacts at an angle of 60 degrees and jumps aside at 30 degrees, with a coefficient of friction of 0.04. Participants suggest using the equation dp = F * dt to analyze the forces involved, particularly the force of friction. They recommend writing out the conservation of momentum and energy equations to solve for the kinetic energy losses during the impact. The conversation emphasizes the importance of understanding the angles and friction in calculating energy loss.
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Law of conservation of enegry and one task :)

I must to do it, but I have no ideas about how to do...
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The washer hits on a horizontal surface of an ice under the corner a=60 and jumps aside under the corner b = 30. Factor of a sliding friction of the washer on the ice u = 0,04. Find losses of kinetic energy of the washer at impact. Movement of the washer consider forward.
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Thanks.
 
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What are the units of a and b?
 
Degrees :)
Someone told me that dp = F * dt, where F is force of friction. Next write law of conservation momentum and energy. And next solve some equtions :)
 
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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