Quote by SAFiiNA
This might make sense to you then you can help me.
For 1st part the volume coefficient of expansionis the fractional increase in volume per unit rise in temperature. The % increase is given so change that to a fraction and divide by the rise in temperature (0.4/15 = 0.0267?? may be :S)
For the 2nd part if you know the vol of the bulb, then you can work out the increase in the actual vol of the liquids because you know it increases by 40%. The tube is a cylinder and liquid will have a vol = area of cross section x length. You know the increase in volume and you know the length so work out the area of cross section and hencethe radius.

I think you explained that very well, SAFiiNA. And judging by the absence of any further query from Pinchie81, I'd conclude that you managed to answer his/her questions!