Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
$!$RatJumper$!$:
Thankx :)
and S09 Q29 if you may please? :)
TJ-56:
--- Quote from: Dania on November 13, 2010, 09:21:29 pm ---Why is the answer A?
--- End quote ---
Momentum before = momentum after so:
mv - mv = 2mV ( the negative sign is given due to the 2 trolleys moving in opposite directions ) so
60m - 40m = 2mV (V is the speed of the 2 together, and the masses are added because they are taken as 1 trolley now)
so simplified would give 10 cm/s
Hypernova:
--- Quote from: $!$RatJumper$!$ on November 13, 2010, 08:56:27 pm ---Help with S09 Q29 and S08 Q26 please :)
--- End quote ---
S09 P1 Q29
The electron has kinetic energy = 1/2 m v2
We know that the electron travels a distance x, then stops. This means that the it lost its kinetic energy since velocity changed from something to zero.
The loss in Ke should equal the work done on the force.
F x X = 1/2 x m x v2 E = F/e
F = Ee so...
EeX = 1/2 x m x v2
X = m x v2
2Ee
$!$RatJumper$!$:
--- Quote from: Hypernova on November 13, 2010, 09:29:08 pm ---S09 P1 Q29
The electron has kinetic energy = 1/2 m v2
We know that the electron travels a distance x, then stops. This means that the it lost its kinetic energy since velocity changed from something to zero.
The loss in Ke should equal the work done on the force.
F x X = 1/2 x m x v2 E = F/e
F = Ee so...
EeX = 1/2 x m x v2
X = m x v2
2Ee
--- End quote ---
+rep :)
Dania:
--- Quote from: TJ-56 on November 13, 2010, 09:25:34 pm ---Momentum before = momentum after so:
mv - mv = 2mV ( the negative sign is given due to the 2 trolleys moving in opposite directions ) so
60m - 40m = 2mV (V is the speed of the 2 together, and the masses are added because they are taken as 1 trolley now)
so simplified would give 10 cm/s
--- End quote ---
Thank You!
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