When calculating the time in SHM between two points, remember to use x=Acos(wt) if the particle starts at the amplitude position and vice versa, use x = Asin(wt) if it starts at the equilibrium position. And always make sure x is the displacement from the origin (I sometimes make the mistake in thinking that it's the displacement from where the particle starts the SHM (which is usually the amplitude) but it's always from the origin!!).
I know but the mark scheme gives -1= 4sin pi/6 times t However sin pi/6 = 1/2 which means t should equal to -1/2 but the markscheme says t= -0.482
Recalculating the COM is so much cleaner. If you use the tan addition formula then you don't even need a calculator (and therefore I've found it the marginally more useful thing for step, but ymmv)
Recalculating the COM is so much cleaner. If you use the tan addition formula then you don't even need a calculator (and therefore I've found it the marginally more useful thing for step, but ymmv)
It seems like it is cleaner yes. I did the instinct which is normally moments and worked first try so I didn't bother anything else. Yeh actually the tan addition formula cleans it up quite nicely. Well played lad, well played.
hmm anyone done M3 Jan 16 (no spoilers to follow)? My friend asked about a method about q7 earlier and it makes sense to me but isnt covered on the markscheme. Could anyone verify this?
hmm anyone done M3 Jan 16 (no spoilers to follow)? My friend asked about a method about q7 earlier and it makes sense to me but isnt covered on the markscheme. Could anyone verify this?
That was the paper I sat, Q7 seemed like a normal typical circular motions question.
Recalculating the COM is so much cleaner. If you use the tan addition formula then you don't even need a calculator (and therefore I've found it the marginally more useful thing for step, but ymmv)
It seems like it is cleaner yes. I did the instinct which is normally moments and worked first try so I didn't bother anything else. Yeh actually the tan addition formula cleans it up quite nicely. Well played lad, well played.
It seems like it is cleaner yes. I did the instinct which is normally moments and worked first try so I didn't bother anything else. Yeh actually the tan addition formula cleans it up quite nicely. Well played lad, well played.