Wednesday, 31 August 2011
Tuesday, 30 August 2011
WHO Model Lists of Essential Medicines
Sunday, 28 August 2011
10 Appealing Cars
Friday, 26 August 2011
Thursday, 25 August 2011
Wednesday, 24 August 2011
Tuesday, 23 August 2011
Most powerful naturally aspirated production engine in the world
Monday, 22 August 2011
Sunday, 21 August 2011
Chemistry: What a bitch... :|
Cars I saw today in the Central Region
Friday, 19 August 2011
AMath
AMath: dismal as usual... 10m question at the back zzz.
Tried to do a trick:
1st Attempt: tried to kick a 500 ml PET bottle through the doorway. Unfortunately, it sailed wide left, and ended up near the dustbin. I thought about it and brought in soccer free-kick techniques.
2nd Attempt: This time, it was brilliant !!! The PET bottle glided past the doorway, dead centre and hit the corridor (wall). The projectile had a nice trajectory, sort of a parabolic trajectory (like a knuckle shot if you can imagine it) I think I did that about 6 meters away from the doorway. Thankfully it did not overshoot the corridor, if not that would be considered high rise littering.
* 500ml Polyethylene terephthalate (PET) bottle courtesy of Daniel Lam.
Here comes the astonishing part. As I was just about to retrieve the PET bottle, I saw Mr Wee. I think Mr Wee was just beside the doorway when the projectile struck the wall. If that ‘free-kick’ had occurred even a second later the consequence could have been worse.
Indeed, the trajectory of a bottle is very difficult to predict, unlike regular objects like a sphere. I’ve managed to demonstrate the Magnus effect previously, using a soccer ball.
Magnus Force:
F = lift force
ρ = density of the fluid
r = radius of the ball
v = velocity of the ball
A = cross-sectional area of ball
CL = lift coefficient
Do i need Soccer Shoes to curve the ball?? please reply....