Finding the current in a resistor

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To find the current across the 20 Ω resistor, understanding series and parallel resistor configurations is essential. The discussion highlights confusion regarding the method to calculate current, with one participant unsure of the teacher's provided answer. The conversation emphasizes the importance of knowing how resistances combine in both series and parallel setups. Clarifying these concepts is crucial for solving the problem effectively. The thread indicates a need for guidance on basic electrical principles to arrive at the correct current value.
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Oops sorry. He gave it to us right as the bell rang so I didn't get it down. But I believe it was .2 ?
 
Do you know how resistances add in series?

Do you know how resistances add in parallel?
 
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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