Recent content by Iain123

Hello, I'm working on a project to design a system that basically turns off all non essential electrical appliances in the home when it is not occupied. The idea is to reduce energy waste caused by lights, TV's computers etc being left on accidentally. So far I'm thinking that each occupant...

Ah i see, so i use this formula ? Trying this using V1 = 0.18 and V2 = 0.9, I'm getting an answer of around 87kJ :frown:

Homework Statement Unit mass of a fluid at a pressure of 3 bar, and with a specific volume of 0.18 m^3/kg, contained in a cylinder fitted with a piston expands reversibly to a pressure of 0.6 bar according to the law p = c/v^2 , where c is a constant. Calculate the work done during the...

Thanks for your reply's, I have attached an image showing my working using both formulas, and also a picture showing the I beam dimensions (web thickness is 20mm). https://ibb.co/nMDCrw Using Skyciv's online beam calculator returns an I value of 7.73x10^6 mm^4 , the same as i got on top line...

Hello, this formula was given to me in an exam to find the moment of inertia of an I beam, https://ibb.co/jY7ZKG However this formula seems to give a different answer to the standard bd^3/12 method, is the formula in the image wrong ? Thanks