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Author Topic: physics doubt HELP  (Read 762 times)

Offline halosh92

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physics doubt HELP
« on: March 06, 2010, 05:37:19 pm »
physics CIE AS
paper 1 2006 oct/nov
 Q2
 Q11
Q12
Q 14
Q17
Q21

and please explain in details
thx ;D

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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline astarmathsandphysics

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Re: physics doubt HELP
« Reply #1 on: March 06, 2010, 06:23:20 pm »
In next half hour
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Offline astarmathsandphysics

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Re: physics doubt HELP
« Reply #2 on: March 06, 2010, 06:36:17 pm »
2)energy =force*distance=Force*(speed*time) B
11)D elastically so momentum and kinetic energy both conserved. This can only happen if D is true
12)conservation of mmentum
momentum before=0
so momentum after =0=1000*5+10v so v=-100 ie in opposite direction to cannon
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Offline astarmathsandphysics

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Re: physics doubt HELP
« Reply #3 on: March 06, 2010, 06:38:42 pm »
14)only B 2 anticlockwise forces or rwo clockwise forces both of magnitude F and distance r from X
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Offline astarmathsandphysics

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Re: physics doubt HELP
« Reply #4 on: March 06, 2010, 06:46:33 pm »
17) efficiebncy=usefull energy/total enerfy *100%=7/100*100=7% A
21)Pressure=pgh for each liquid
P=830*9.8*x=8134x for oil
P=1000*9.8*(2000-x) for water
total pressure =8134x+19600000-9800x=17500000
1666x=2100000 s0 x=1260 D
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