SpykerC8Aileron

Fine, don't answer me.

Yes, hoorah! It's a whole number. Thanks for all the help (and patience). One final question: what are the units for this; I know that it can vary, so it would be great if you could tell me the specific unit for the one that you've shown me. Then, I promise, that's it.

The marble (ball) is 1.6cm in diameter and weighs 5.92g. Therefore, its volume is 17.15728468cm^3. The measuring-cylinder that I dropped the marble in is 25.5cm tall and has a radius of 2.5cm. The water weighed 503.26g in this case. The density of the measuring-cylinder is therefore in kg/cm^3. So do you have a 2.5 metre ball? Is 'r' the radius of the ball, or the radius of the measuring-cylinder? '2.5cm' is the radius of the measuring-cylinder. 2.5 metre I thought that it was in cm already. I can't quite see where I've put something in metres. If everything is in cm, then surely the units are consistent. Both densities and all radii are in centimetres.

I thought that that was V. EDIT: Ignore what I just wrote there; V is 9.8, of course. I think that I'm ready: {[(2X2.5^2)9.81]/9(9.8)}(0.35-1.00652) EDIT (2): I got a minus-number for an answer. That can't be right, can it? I got -0.9127637, followed by many more numbers

I'm probably going to make myself sound incredibly stupid now, but is the acceleration due to gravity constant then? Also, is there any way to insert a picture into this thread? Once again, thanks for all the help so far! EDIT: I think that I've worked out how to do it, as it says on 'Bitesize' that 1kg = 10N, so I take it that the force of attraction is 10... I think.

I'm not sure if I fully understand it either. I'm just doing what I've been told to do, and I hate coursework anyway.

I don't have the drag force - only the masses and lengths, and therefore the densities.

I know. I promise that I'm not making this up. My teacher said himself that it was A-level, and as far as I can tell I can still get full marks without it, but to put it in his own words: 'I'd be very disappointed if you didn't include Stoke's Law'. Thanks for the speedy response!

For a piece of GCSE physics coursework, my science teacher has decided that we must all work out the viscosity of some fluids using Stoke's Law, despite there being no mention of it anywhere in the syllabus. Apparently, we are doing it to 'impress the examiner'. The trouble is that I cannot find any websites which provide Stoke's Law in the format necessary to calculate viscosity. I'm aware that there are internet-calculators that can do this for me, however my teacher quickly got wise of these and is now forcing us to write down every piece of working. I'm not asking you to do the calculations for me - I'm not that lazy - but it would really help if someone could provide the formula in the format for working out viscosity. Thanks in advance! -Spyker