Electromagnetism Help: Get Unstuck Now!

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The discussion revolves around a request for help with an electromagnetism problem related to power consumption of an appliance when switching from a 120 V outlet in Canada to a 240 V outlet in the UK. Participants emphasize the importance of showing effort in problem-solving before receiving assistance. The original problem statement was edited by the original poster, leading to confusion and a lack of clarity in the discussion. The thread ultimately concludes without a resolution due to the missing information and the OP's decision to edit their post. The conversation highlights the necessity of adhering to homework guidelines for effective assistance.
butterflycandy
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Homework Statement
nevermind
Relevant Equations
V=IR
Completely lost :(
 
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This may be difficult to answer without more info.
 
me too. what's your question?
 
hutchphd said:
This may be difficult to answer without more info.
DaveE said:
me too. what's your question?
When I first replied, there was a problem statement about an electrical appliance that consumes 800 W when connected to a 120 V outlet in Canada. The question was how much power it would consume in the UK where the outlets are 240 V. There were five choices, all in kW, which I don't remember except for the correct one which can be easily reconstructed and "zero" which means that Canadian appliances in the UK would be useless.

It seems that OP replaced the statement of the problem with "nevermind", but the post was not stamped as having been edited. Oh well.
 
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Yeah, he edited it right away, so there is no "History" link in his post that I can see. Thread is closed.
 
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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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