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  1. W

    Exam Problem: Rounds per minute into Megabits per second

    You would need to find out how many megabits can be read in one revolution. Then it should be pretty easy, but without that information, I have a feeling this problem is impossible.
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    Atomic E of a girl

    That should be right. Why do you need to know? Are you planning to put the girl through nulcear fission...?
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    Circuit help

    voltage is easy, using loop rule you know that it is equal to the voltage of the battery. Then for the current and equ. resistance, just do what OlderDan said.
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    Big brains LOOK UP this small limit problem

    That graph is correct, it just has a very strange scale so it doesn't accurately portray the shape of the graph. It does show the limit x->0 very well though.
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    Want to move on from XP to Linux, please help

    I have used ubuntu and mandriva (aka Mandrake 2005) and I liked them both. The only reason I'm still using xp is because of compatibility issues with my wireless adapter and games and stuff like that. Once I get to college (this august) and have a direct connection, I'm going to try to switch...
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    Hard math question

    The volume of the large container is 4*volume of oj concentrate you would then divide that by the volume of the glass (-1 cm of height)
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    Mechanical energy of a basketball

    1. Mechanical energy is potential energy + kinetic energy. You need to calculate the mechanical energy before and after the bounce. 2. Work = Change in KE (which = change in ME in this case) W = Fd
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    2 quick chem question

    That's right. It's just all those rules I have crammed into my head tend to get mixed up, especially when its almost 1 in the morning.
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    Partial pressures

    it would be 27x^4=2.5*10^7, you forgot to cube the 3.
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    Ideal Gas Volume Question

    STP stands for standard temperature and pressure. it is 0 degrees C and 1 atm.
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    Equations of Motion Help

    Yes, I definately could have. All it is is a goofy unit conversion problem. One thing I learned from my AP physics class is that you need to keep with it and ask for help if you need it. Once you get the concepts, physics is really cool and a lot of fun. Until then...let's just say i still have...
  12. W

    Partial pressures

    for ever x atm of N2 there are 3x atm of H2. So (x)(3x)^3=2.5*10^7
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    Equations of Motion Help

    45 mile/(hr*s) * 1 hr/3600 s = 0.0125 mile/s^2 .0125 mi/s^2 * 1609.344 m/1 mile = 20.1 m/s^2
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    I am going to do a presentation on time-travel tomorrow.

    What about the grandfather paradox? That's a classic.
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    Equations of Motion Help

    I did it and got the correct answer. Well, my calculator did it. You are either using incorrect conversions or doing a conversion wrong. 1 mile = 1609.344 meters 1 hour = 3600 seconds
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    Homework help.

    Ah. True. I'm not thinking, it's almost midnight here. Now that you mention it, it will go up a significant amount. sterlinghubbard, one thing you also want to think about is that books don't always have the most realistic answers. I remember a calc problem with a 6.5 foot tall thief running as...
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    Homework help.

    But it is not hit straight up, it is hit at an angle. If it is hit at a low enough angle, it could rise to only 10 feet in that time. Ignore my previous post, i was wrong. You want v-final = v-initial + g*t. Calculate the inital vertical velocity and then you should be able to go from there...
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    2 quick chem question

    Temperature and in some cases, the concentration of the reactants, depending on the order of the reaction (if you are unsure of what I'm talking about, just ignore it). [edit] sorry, i didn't read your whole post. And i don't think catalysts speed up the reaction, they simply allow it to...
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    Homework help.

    Could you show your work? If you show it we could probably point out what you did wrong. But I assume you are using the basic mechanics equations? The one you probably would want to start with is v-final^2 = v-initial^2 + 2*g*h.
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    Equations of Motion Help

    It's just unit conversions. The acceleration is 45 miles/hour/second, and when converted, it gives you 20.1 meters/second^2
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    Partial pressures

    1. Kp = (Partial Pressure NH3)^2 / ((PP N2) * (PP H2)^3) 2. Kc = [NH3]^2 * [CO2] That should get you started.
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    Schools What system of measurment is used in US Universities?

    Standard may be used in common life, but metric is all we ever used when I took AP calc and AP physics this year.
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    Big brains LOOK UP this small limit problem

    No, you are right. There is no limit. the limit as x->0 of e^x/x is undefined.
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    Breaking The Speed Of Light!

    I also remember reading something about this too. I don't remember where, and I think it has something to do with quantum tunneling, but I can't be certain.
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    Conservation of Energy Problem

    I'll bet your problem is that your first equation is wrong. The units don't match. you have m^2/s^2=kg*m/s^2. The equation you want is v-final^2=v-initial^2+2gh, and I also believe you mean vertical velocity, not horizontal in your first step.
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