Hey I posted in homework help but now it's gone

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Posts related to homework problems may be deleted by mentors if they lack evidence of effort in solving the problem. Users will receive a warning notification explaining the deletion, which can be viewed by clicking the Envelope icon on the site. Additionally, homework posts made in incorrect forum sections or violating other rules may also be removed. To understand the guidelines, users are encouraged to review the forum's general rules and specific homework guidelines. Following these rules is essential for maintaining the integrity of the forum.
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If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will also send you a warning notification which explains why your post was deleted.

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(last updated Nov 30, 2021 by Mark44)
 
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Likes dipcario34, M. M. Fahad Joy, Avimanyu Ray and 4 others
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...
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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