PHYSICS AS HELP

[halosh92]

2009 JUN physics cie
paper 1
Q9
Q11
Q13
Q20
Q21
q29

thxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

[astarmathsandphysics]

Q9
Q11
Q13
Q20
Q21
q29
q9 change in momentum =m(v-u)=0.1(20--30)=5 B
11)A the deeper you go, the greater the pressure
13)c 0.2*900=0.6*F
20)Y=Fl/Ae so F=YAe/l double the length means half the force and half the area means half the force
Acos 1/2*1/2=1/4
21)1/2*.3*12=1.8 A
29)d conservation of energy 1/2mv^2=qV=qEx

[Saladin]

mr paul

u r getting fast these days

i never much of a chance to answer a physics or math question b4 u do.

[astarmathsandphysics]

I try . And my pc doesnt work cos I misupgraded the os

[saifalan]

And I thought astar was one of those computer geeks 

[astarmathsandphysics]

Nope. Just am amateur

[halosh92]

Q9
Q11
Q13
Q20
Q21
q29
q9 change in momentum =m(v-u)=0.1(20--30)=5 B
11)A the deeper you go, the greater the pressure
13)c 0.2*900=0.6*F
20)Y=Fl/Ae so F=YAe/l double the length means half the force and half the area means half the force
Acos 1/2*1/2=1/4
21)1/2*.3*12=1.8 A
29)d conservation of energy 1/2mv^2=qV=qEx

thx alott!!!!!!!!!!!!!!! gr8 and fathomable  !!!!!!!

[halosh92]

Q9
Q11
Q13
Q20
Q21
q29
q9 change in momentum =m(v-u)=0.1(20--30)=5 B
11)A the deeper you go, the greater the pressure
13)c 0.2*900=0.6*F
20)Y=Fl/Ae so F=YAe/l double the length means half the force and half the area means half the force
Acos 1/2*1/2=1/4
21)1/2*.3*12=1.8 A


could you please explain furthur on question 13 and 21
29)d conservation of energy 1/2mv^2=qV=qEx

[SGVaibhav]

And I thought astar was one of those computer geeks 

Nope. Just am amateur

Aha amateur geek

[nox_fjmoony]

I try . And my pc doesnt work cos I misupgraded the os

how so?

[astarmathsandphysics]

Is half working now