Qualification > Sciences
Physics help
emi:
i have this IGCSE guide for physics and after each topic there are Questions , and these are from them .
twilight:
aha .. gud :D
because i cudnt remember anything like that in Physics IGCSE ...
By the way i got A* in Physics and Maths ;)
astarmathsandphysics:
--- Quote from: emi on May 05, 2009, 05:48:49 pm ---another Q ..
how do we calculate energy stored ?
here is a Question :
A bungee jumper of mass 60kg jumps from a bridge tied to an elastic rope which becomes taut after he falls 10m. Consider the jumper when he has fallen another 10m and is traveling at 15m/s
a) work out how much energy us stored in the rope, take g=10 m/s2 and ignore air resistance .
plz some one help me out
--- End quote ---
Conservation of Energy
Energy to start=0
so 0=mgh+EPE+1/2mv2
so 0=60*10*-20+EPE+1/2*60*152 so EPE=12000-6750=5250J
emi:
thanks :)
and twilight thats awesome, i wish i can be like you =]
nid404:
Guys I'm stuck with this magnetic deflection thingy og radioactive particles. Can anyone just help me understand what is meant by -the magnetic field acts into the plane of the paper. Moreover this makes it even harder to understand the deflection. Please tell me how I know if the deflection is into the paper or out of the paper. I'm screwed. I need help.
Just for your information
-The mark scheme for june 2006, paper 3, last question says that alpha particles move into the paper and beta out of the paper. Please refer to this question if possible.
-The textbook (IGCSE physics by Tom Duncan)says the deflection can be found from the left hand rule, taking negative charge moving to the right as equivalent to positive( conventional) current to the left.
I just don't understand it
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