# Lab Report #4

Page 4 of 4   1, 2, 3, 4

## Does anyone know what is the SI unit for N?

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?

forhide
Guest

## Units for N

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

Guest100
Guest

Guest100
Guest

## Re: Lab Report #4

does anyone know how to calculate delta PE and KE?

guest11
Guest

## part 2 of question 23

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

guest88
Guest

## Question 23- Delta change in KE

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

Kalo
Guest

## question 16

does anybody know what 16 is?

guestttt
Guest

## question 23

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

gues70
Guest

## #12, 21, 2,3

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?

help me
Guest

## Me

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

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.

Delta KE
Guest

## HELP with delta PE PLEASE !!!!

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 ! . If anyone Know how to do this step by step .. please let me know.

Thank you !!

BGGirl

Posts : 6
Join date : 2008-09-21

## Re: Lab Report #4

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?

Guest01

Posts : 133
Join date : 2008-09-19

## slope

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

confused
Guest

## Re: Lab Report #4

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.

Guest01

Posts : 133
Join date : 2008-09-19

## Question 21 and 22

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

THANKS!

stuckk
Guest

## Re: Lab Report #4

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..

confused
Guest

## Re: Lab Report #4

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

What problems are you having with 21 and 22?

Guest01

Posts : 133
Join date : 2008-09-19