Recent content by sclatters

Homework Statement I have been able to complete all questions apart from part e) Homework Equations Beta minus decay involves electron emission Beta plus decay involves positron emission Electron capture takes in an electronThe Attempt at a Solution I believe that because there is an...

Homework Statement Homework Equations The divergence theorem is quoted on the problem sheet. The Attempt at a Solution I am struggling with the last question (2)c)). I have tried to put the continuity equation into the divergence theorem and have got: ∫S J.ds=-d/dt∫V ρdV But...

Sorry I didn't know how to extend the square root, I'll have to learn! Thanks for the help!

Thanks, that's my poor inputting! ABC: a=((√0.7gr)+5)2/r ACB: a=((√0.7gr)-5)2/r (To be inputted into a calculator) I hope these look better!

Ok, so I now have the following apparent weights: Velocity of astronaut=5m/s Velocity of rotating space station=(√0.7gr)m/s For ABC: a=((√0.7gr)+5)/r For ACB: a=((√0.7gr)-5)/r Do these sound ok?

Homework Statement Homework Equations a=v2/r f=mv2/r The Attempt at a Solution I have been able to complete this first part of the question by equating 0.7g to v2/r, solving to find v then calculating T by looking at the circumference of the cylinder and using v=d/T. I'm...

Sorry, I was thinking about the x and y components. They both equal (ma^2)/4 and the z component equals the x and y components added together. This gives the moment of inertia to be (ma^2)/2 straight through the disk as if it were spinning like a CD. Is this correct?

I'm not sure why it isn't (ma^2)/4? Do I need to use the parallel axis theorem to find the moment of inertia in another position? Maybe at the point the spinning top intercepts the origin O?

Of course, Ma2/4. Thank you very much for your help again!

Great, thanks! I am a little unsure on how to express I in terms of the variables given though?

Homework Statement http://i42.tinypic.com/20adicz.jpgHomework Equations torque=rxF angular precession velocity=Δtheta/Δt assume that Δtheta=ΔL/Lsin(theta)The Attempt at a Solution I can conclude that the subsequent motion of the top will be an anti-clockwise circle about the origin but would...

So I need to calculate the linear acceleration of the centre of the plank then apply Newtons 2nd law to this? This would give the net force on the plank? After this I could deduce that the the net force=mg-(the load on the other hand? Would this work?

Homework Statement a)Two people are holding the ends of a plank of length l and mass M. Show that, if one suddenly let's go, the initial acceleration of the free end (aD) is 3g/2. (7 marks). Moment of inertia, I, of the plank about its centre of mass is given by I=1/12(Ml2) b)Show...