Solving M_x=U_x |r X R|: Need Help?

  • Thread starter Thread starter suspenc3
  • Start date Start date
AI Thread Summary
The discussion revolves around solving the equation M_x=U_x |r X R|, where r represents the distance from a point on the x-axis to the line of action of the force. The original poster expresses uncertainty about how to approach the problem and mentions attempting to plug in numbers without success. They seek assistance in understanding the correct method to solve the equation. An attachment that likely contains relevant information is missing, which may hinder the ability to provide specific help. Overall, the thread highlights a need for guidance in tackling the mechanics problem effectively.
suspenc3
Messages
400
Reaction score
0

Homework Statement


See attachment


Homework Equations



I was thinking : M_x=U_x |r X R|

where r is going to be the distance from any point on the x-axis to any point on the line of action of the force



The Attempt at a Solution


Im not really sure how to exactly do this problem...Ive been plugging in numbers hoping for the best but nothing good has come out of it...Any help would be appreciate.
 
Physics news on Phys.org
Attachment, please, is missing.
 
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}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top