Lab Report #4

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Does anyone know what is the SI unit for N?

Post  forhide on Thu Oct 16, 2008 1:37 am

just no way to figure it out except for leaving it blank

Since N is just number, there is supposed to be no unit. Isn't it?

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Units for N

Post  Guest100 on Thu Oct 16, 2008 1:54 am

Type the word "none" for the units of N.

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http://phy121help.blogspot.com/

Post  Guest100 on Thu Oct 16, 2008 11:17 am


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Re: Lab Report #4

Post  guest11 on Thu Oct 16, 2008 2:55 pm

does anyone know how to calculate delta PE and KE?

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part 2 of question 23

Post  guest88 on Thu Oct 16, 2008 3:19 pm

i was just wondering if anyone had insight into their process.

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Question 23- Delta change in KE

Post  Kalo on Fri Oct 17, 2008 12:32 pm

Does anyone know how to calculate Delta change in KE in question 23.
Thanks.

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question 16

Post  guestttt on Fri Oct 17, 2008 2:11 pm

does anybody know what 16 is?

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question 23

Post  gues70 on Fri Oct 17, 2008 2:35 pm

i can't seem to figure out how to figure out those 2.

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#12, 21, 2,3

Post  help me on Fri Oct 17, 2008 5:16 pm

Anyone know the units for deltah/h for question 12? I thought it would be meters but it says its wrong. anyone know how to calculate deltaPE? I did the equation given times PE and then another time without multiplying by PE but it still doesn't work. Any suggestions? Oh, and is the pictures for #2, and 3 not working for anyone else either, because they aren't coming up for me?

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Me

Post  Delta KE on Fri Oct 17, 2008 7:40 pm

To calculate the Delta KE in question 23, you use the equation:

(Deltad/d)*(M+m)*(v_n^2-v_1^2)

Making sure that d is in meters, m is in kg.
v_n is equal to the number measurement it is...so for measurement one its v1^2-v1^2, for two its v2^2-v1^2, etc.

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HELP with delta PE PLEASE !!!!

Post  BGGirl on Sat Oct 18, 2008 9:40 am

Does anyone Know how to calculate delta PE .. and how to enter it into the calculator to receive the correct value ( I have tired numerous time and different ways). and still can't get it. LOL and frankly I am getting really frustrated ! Neutral Evil or Very Mad scratch . If anyone Know how to do this step by step .. please let me know.

Thank you !!

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Re: Lab Report #4

Post  Guest01 on Sat Oct 18, 2008 9:32 pm

For DeltaPE you should get a constant by using Expression 6 from Error and Uncertainty and times that by each PEn to get 8 different DeltaPE's. You should be squaring Deltam/m and Deltah/h. Add them then find its square root. This will be your constant and using Expression 6. To use it as Expression 7 all you do is multiply that "constant" (I use that term loosely) to the error your finding it for, in this case it is the PE. You have already figured out Deltah/h for some other part I believe. There are also no units for it, so enter in "none".

Capisci?

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slope

Post  confused on Mon Oct 20, 2008 12:48 am

I end up with a slope of -2.6 and maple TA marks it as wrong. All my other calculations are correct according to maple TA so then why would i obtain a value that is so high? I calculated slope like I normally do on the other labs

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Re: Lab Report #4

Post  Guest01 on Mon Oct 20, 2008 1:21 am

I think over on professor dawber's blog people are having the same problem and it's not that your calculations are incorrect but MapleTA's software won't accept such a "big" number, I'm guessing it should be -1.xx.

I'd either use two other points for slope, even if they are right next to each other, but some slope with a one value. You can also just make up a number I noticed since it seems there is no way for MapleTA to actually calculate slope. That is, just as an experiment enter in any values you want for slope and it's error within reason and by reason I mean -1, -1.23, -1.76, as your heart fancies. You should mark it correct then.

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Question 21 and 22

Post  stuckk on Mon Oct 20, 2008 8:47 am

DOES ANYONE KNOW HOW TO DO IT? I'VE TRIED AND YET I CANT GET IT TO WORK......


THANKS!

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Re: Lab Report #4

Post  confused on Mon Oct 20, 2008 9:01 am

yeah i tried and i noticed it accepts any values between -.1 and -1.9, but i feel like my TA would check that anyway and see that I lied. I still can't calculate values for PE either, i used the equation you suggested and it keeps being marked as wrong even though all my values for delta h/h and delta m/m are correct..

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Re: Lab Report #4

Post  Guest01 on Mon Oct 20, 2008 8:55 pm

Sounds like your data is messed up somewhere. Can you post your results/calculations?

What problems are you having with 21 and 22?

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Re: Lab Report #4

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