Thank you. With this and some more looking around I think I better understand how to read / work with the theorem now. I was misunderstanding the theorem and wasn't thinking it through properly. The value of |Pn - P| is supposed to be less than the specified tolerance, so since it's <=...
Homework Statement
This is a homework problem for a numerical analysis class.
Use the following theorem to find bounds for the number of iterations needed to achieve an approximation with accuracy 10^-5 to the solution of the equation given in part (a) lying in the intervals [-3,-2] and...
Homework Statement
A 3 wt% HF / 12 wt% HCL treatment is injected without an HCL preflush into a sandstone reservoir containing 10% CaCO3. If half of the HF is consumed in reaction with CaCO3 to form CaF2, what will be the next porosity change, considering both CaCO3 dissolution and CaF2...
Homework Statement
Attached is a pdf of the assignment problems, I'm looking at problem 1 under the "Try" section. It shows a rod attached to a wall bracket on the left, with a force applied on the right side.
I'm also including a link to the solution, it's under "Problem 3.83" -...
I see, thank you. I went with that and he just posted the solutions, I got the correct answers. A) 30.76 watts to keep the fridge temperature constant, B) 70.76 watts to power the bulb and compensate for the heat, and then after calculations C) $61.60 a year extra to pay for it. I guess he could...
Homework Statement
Note - I've asked a very similar problem to this before but I'm redoing it for practice, and this one asks a new question which just ruins everything. I also don't know if I was right the first time yet because I haven't gotten the paper back.
Consider a refrigerator whose...
I see, thank you for clarifying. I need to get better about being more formal when I talk about units. I'm going to mark this as solved then. Thank you again for all your time and help, I really appreciate it!
I'm not clear on this, so you're saying it's not arbitrary how you define a short period here? If I used joules to find the extra work input I'd still get an extra 30.76 joules needed whenever the bulb is on, but that's for 1 second because the bulb gives out 40 joules of heat per second. The...
Thank you! But as for the units, I can use watts instead of joules can't I? That's what our textbook says at least. The COP is a dimensionless ratio so the units would cancel out, so I thought I'd keep it all in watts since the question asks for power consumption anyway. I was always using watts...
I see what you mean. So you think the problem statement is a genuinely bad one? Do you think it'd be acceptable to say the answer is .888 kWh ? I've tried but I just can't see any way to get farther than that without any sort of time frame or velocity of exiting gas, something like that.
So if the bulb adds 40 watts of heat to the fridge, the fridge has to increase its QL by 40 J/sec? And that requires a new work input such that the COP remains 1.3? How exactly do I get to any of these numbers if I wasn't given a normal QL, QH, or W for the fridge?
EDIT - so I played around...
etrevino94 said I could convert KJ to KwH, where 1 KwH = 3600 KJ. I looked online for unit converters for more peace of mind and they said the same thing, so then I worked it out myself.
A Kw is 1 KJ/second, so a KwH is a KJ/second for a continuous hour, or A KJ/second for 3600 seconds...
I was afraid of that, so this problem becomes more complicated. If that's the case then looking back at the COP, 1.3 = QL(per sec) / W-input (per sec)
But that's for the entire fridge I would assume, so W-input(per sec) is not 40 J/sec, it's not a work input of the lightbulb.
I'm having...
Homework Statement
Consider a refrigerator whose 40-W light bulb remains on continuously as a result of a malfunctioning of the switch inside the refrigerator. The refrigerator has a coefficient of performance (COP) of 1.3 and the cost of electricity is estimated to be 10 cents per kWh...