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P1 CIE physics doubts

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astarmathsandphysics:
22. each spring now support 1.5*2=3 times the weight
30charge=average current*time=(20mA+100mA)*8=480mC
40.2 ups and 1 down cos charge must add to1e

sweetie:
okay...
if each spring now has extension 3x , so since they both r in parallel, isnt the total suppose to be 3x/2????????

and for Q30 why dont we consider the difference between the 2 values??

astarmathsandphysics:
The weight is doubled so the extension is doubled

sweetie:

--- Quote from: astarmathsandphysics on April 26, 2010, 12:03:20 am ---10 approach speed=u1+u2
separation speed=v2-v1
they are equal for elastic collisions  D
11.res for both particles using F=ma
for 2g particle 2g-T=2a (1)
for 6g particle T-6=6a (2)
(1) +(2) 2g-6=8a so a/(2*9.8-6)/8=1.7 B
32)1/R=1/100+1/10+1/10+1/10+1/10+1/10+1/10=61/100
R=100/61 B


--- End quote ---

But , for Q11 how do we know that the acceleration of  the 2 boxes r the same??????

nid404:

--- Quote from: sweetie on April 28, 2010, 10:28:55 pm ---okay...
if each spring now has extension 3x , so since they both r in parallel, isnt the total suppose to be 3x/2????????


--- End quote ---

W=kx
k=W/x
now when one spring is removed, value of k reduced to 2/3 of it's previous...which is 2W/3x
2W=2w/3x x e
e=3x

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