Nonconsevative force ramp problem

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The discussion revolves around a physics problem involving a box sliding down a ramp with given parameters such as mass, gravitational acceleration, and coefficients of static and dynamic friction. The key question is determining the coefficient of dynamic friction required for the box to stop at the bottom of a ramp inclined at 30 degrees and 1 meter high. Participants note the lack of initial velocity information, which is crucial for solving the problem accurately. The problem statement's focus on finding the coefficient of dynamic friction raises questions about the assumptions made in the scenario. Overall, the conversation highlights the importance of clear problem definitions in physics.
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Homework Statement



m1=2kg, g=10m/s2, coefficient of static friction=0.6 y coefficient of dynamic friction=0.4 .

So there is a box m1 at the top of a ramp, and one assume is slidding.

2.¿if the angle of the ramp = 30o , the height of the ramp =1m. What is the coefficient of dynamic friction so the box stops at the bottom of the ramp?


Homework Equations





The Attempt at a Solution

 
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Why does your problem statement specify the value that you're supposedly trying to find (the coefficient of dynamic friction)? Also, there's no mention of initial velocity for the sliding box.
 
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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