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seen Nov 12 '13 at 18:53

Jun
20
accepted Having trouble understanding the work energy principle intuitively
Jun
20
comment Having trouble understanding the work energy principle intuitively
That formula has just clarified everything to a huge extent! I wish it had been taught to me like that initially. Thank you.
Jun
20
awarded  Supporter
Jun
20
comment Having trouble understanding the work energy principle intuitively
Oh wow that's a really great explanation! Exactly what I was after. Just a small question - in step 4 when you say to be careful about the sign of terms, what defines the sign? For example, in this question cl.ly/image/3H28063g2m1u the mark scheme says the total change in energy is the POSITIVE change in KE plus the change in PE, even though there is a loss in kinetic energy. This seems odd to me...
Jun
20
asked Having trouble understanding the work energy principle intuitively
Apr
17
comment How fast did hydrogen atoms travel when they were first formed in the early universe?
That's great, thanks! I don't need it to be hugely accurate so as long as its close that's good.
Apr
17
accepted How fast did hydrogen atoms travel when they were first formed in the early universe?
Apr
17
comment How fast did hydrogen atoms travel when they were first formed in the early universe?
I got around 8000m/s using v=sqrt[3kt/m], is that along the right lines? Thanks.
Apr
17
asked How fast did hydrogen atoms travel when they were first formed in the early universe?
Nov
3
awarded  Scholar
Nov
3
accepted What does a positive gradient on a graph of V plotted against I mean in terms of EMF and internal resistance?
Nov
3
comment What does a positive gradient on a graph of V plotted against I mean in terms of EMF and internal resistance?
Oh cool that's pretty interesting. Do you know if there's anything written up on this so I can explore it further? Thanks.
Nov
3
asked What does a positive gradient on a graph of V plotted against I mean in terms of EMF and internal resistance?
Nov
1
awarded  Student
Oct
31
comment Finding an equation relating the mass of a blade of a wind turbine to its velocity
How do I algebraically manipulate the moment of inertia if its a summation with two variables? Can I assume m and r are constant so its just Nmr^2?
Oct
31
comment Finding an equation relating the mass of a blade of a wind turbine to its velocity
Could you possible give me an example of how I would do that? Thank you.
Oct
31
asked Finding an equation relating the mass of a blade of a wind turbine to its velocity