anonymous
  • anonymous
can i ask a physics question pls .......
Mathematics
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anonymous
  • anonymous
can i ask a physics question pls .......
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
no!
anonymous
  • anonymous
:p
anonymous
  • anonymous
y

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anonymous
  • anonymous
i have urgent problem
anonymous
  • anonymous
u can ask,but no guarantee for the solution :)
anonymous
  • anonymous
my question is: If the momentum of a moving object is increased by 100%. Than the Kinetic energy of that object will be increased by :
anonymous
  • anonymous
p = mv = momentum
anonymous
  • anonymous
K = kinetic energy = (1/2)mv^2
anonymous
  • anonymous
if we double momentum, that means instead of p = mv , we have p=2mv
anonymous
  • anonymous
now , p = 2K/ v
anonymous
  • anonymous
so K = pv/2
anonymous
  • anonymous
wait, think I went round in a circle :|
anonymous
  • anonymous
but its just playing with equations, and ratios
anonymous
  • anonymous
KE = 1/2* mv^2 = 1/2* p* v
anonymous
  • anonymous
I think we can safely assume that all the in increase in momentum is due to velocity, not a change in mass
anonymous
  • anonymous
that makes it much easier
anonymous
  • anonymous
i guess kinetic energy would be doubled
anonymous
  • anonymous
so we essentially double our velocity
anonymous
  • anonymous
which quadruples our kinetic energy
anonymous
  • anonymous
we square velocity in the equation
anonymous
  • anonymous
ie times by 4
anonymous
  • anonymous
bad explaination Kinetic energy of object mass m, velocity v: = (1/2) m v^2 Kinetic energy of object mass m , velocity 2v : = (1/2) m (2v)^2 = (1/2) m v^2 (4) = 4K

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