What Are the Key Aspects of Phase Transitions?

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The discussion highlights confusion regarding a graph depicting energy and temperature in relation to phase transitions, emphasizing the lack of clarity on how energy is added over time. Participants note that the question associated with the graph is poorly constructed, as it references time-dependent terms without providing relevant context. There is agreement that the optional answers misinterpret the graph's intent, leading to potential misunderstandings. One participant suggests that if faced with a test question based on this graph, they would choose an answer that aligns with the implied concept of energy absorption without temperature change. Overall, the conversation underscores the need for clearer questions in educational materials.
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The question doesn't look well written to me. It is a graph of energy and temperature, and there is no apparent statement that the energy is added continuously or sporadically at any particular rate, i.e what the time dependency may be.

Either statement looks to me like it may be true depending on how the energy may have time-wise been added.
 
LowlyPion said:
The question doesn't look well written to me. It is a graph of energy and temperature, and there is no apparent statement that the energy is added continuously or sporadically at any particular rate, i.e what the time dependency may be.

Either statement looks to me like it may be true depending on how the energy may have time-wise been added.


Ahh thank you...I'm not going crazy then! You have no idea how many erroneous questions I've come across (I'm at an online school--biggest mistake ever). I will report this as yet another error...thanks again.
 
Agree with LowlyPion. The optional answers speak of time (with words like 'continuous' and 'sporadic') yet the graphic has nothing to do with time. Also your comment makes it clear you know what's going on. Anyway, if I got this on a test I'd pick answer 'A' because it looks like the point the teacher is trying to make (albeit erroneously) was that there are situations wherein IFF the water absorbs energy continuously, it will not change temperature.
 
Ok, thanks, yeah that makes sense.
 
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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