Recent content by db1

have it now, thanks

What volume does 1 mole of gas occupy at 1 atm pressure and 273.15K? PV = nRT so V =nRT/P V = (1)(8.314)(273.15)/1 Im getting 2270.96, the answer is ment to be 22.4L, what am i doing wrong? P= 1 V= ? n= 1 R= 8314 T= 273.15K

have it now, thanks for your help

its just talking about the combined gas equation PV/T= constant it isn't saying anything about m or R yet

P2 = 8atm, I am just not sure how to work it out

just says a quantity of gas

How do i calculate pressure? P1 = 3atm .... P2 = ? V1 = 4 m3...V2 = 2 m3(half original) T1 = 300k...T2 = 400 how do i calculate pressure when V2 changes? Thanks for any help

can anyone help with this please?

Could someone take a ganders at this and see if i have it right please? i just want to make sure i got cos and sin right. if you could do the question and see if you get the same it would be great. thanks for your help i just put a link to the page i uploaded it to, i don't know how to downsize...

hi, its breaking them down to get the sin and cos that I am having trouble with, i just can't remember how to do it on a calculator, its been drivin me crazy all night. i know how to calculate IN once i get them to a single function. could you explain how i get it on a calculator please?

anyone any ideas on this?

my problem is getting the value of cos and sin in the diagram bellow. i haven't used a scientific calculator for a good few years. I am fine calculating IN once i have cos and sin, I am just not sure how to get the 10, -10 and -12.5 for cos and o, -17.32, and 21.65 for sin. thanks for your help...

well.. the diagram shows 3 single phase resistive loads connected to a 400v 3 phase supply. Determine the magnitude of the current flowing in the neutral conductor by graphical means or by calculation. L1= 0º L2= -120º L3= -240º thanks for the help!

hi all, its been a while since I've used a scientific calculator, anyway i am having trouble with cos. I've been askes to find the magnitude of the current flowing in the neutral conducter. V = 400 Lv=231 R1= 23 R2=11.5 R3=9.2 I1=10.04 I2=20 I3=25.1 my real trouble is using a...