- #1
BananaMan
- 41
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dear god i just typed a full page and it decided to give me a 404, i hate computers.
First time i had to use this forum in a long time but I am very stuck today and can't find a way out of it after over an hour and with reading my notes so here goes.
1)a proton of mass m traveling at 300m/s collides with a stationary carbon nucleus of mass 12m, the collision is elastic and head-on.
(a) find the velocity of the centre of mass of the system, for this i took an imaginary particle of mass 13m and used conservation of momentum to find a velocity of 23.07m/s ...not sure if that is right
(b) find the velocity of the proton after the collision in the centre of mass reference frame I've tried playing around with conservation of momentum for a while and with conservation of kinetic energy but my answer seems to always come out at either 0 or 300, not got a clue what I am doing wrong
(c)find the velocity of the proton after the collision in the lab reference frame i really am stuck on how to do this with conservation of momentum giving me one equation but 2 un-knowns
2)a bullet of mass m1 is fired with a speed v into the bob of a ballistic pendulum of mass m2. find the maximum height h attained by the bob if the bullet passes through the bob and emerges with a speed v/2 unfortunately i was hungover during this lecture and ended up falling asleep... whoooops, but it was a birthday night before so how could i not?
if anyone could point me in the right direction with these it would be greately appreciated
thanks
First time i had to use this forum in a long time but I am very stuck today and can't find a way out of it after over an hour and with reading my notes so here goes.
1)a proton of mass m traveling at 300m/s collides with a stationary carbon nucleus of mass 12m, the collision is elastic and head-on.
(a) find the velocity of the centre of mass of the system, for this i took an imaginary particle of mass 13m and used conservation of momentum to find a velocity of 23.07m/s ...not sure if that is right
(b) find the velocity of the proton after the collision in the centre of mass reference frame I've tried playing around with conservation of momentum for a while and with conservation of kinetic energy but my answer seems to always come out at either 0 or 300, not got a clue what I am doing wrong
(c)find the velocity of the proton after the collision in the lab reference frame i really am stuck on how to do this with conservation of momentum giving me one equation but 2 un-knowns
2)a bullet of mass m1 is fired with a speed v into the bob of a ballistic pendulum of mass m2. find the maximum height h attained by the bob if the bullet passes through the bob and emerges with a speed v/2 unfortunately i was hungover during this lecture and ended up falling asleep... whoooops, but it was a birthday night before so how could i not?
if anyone could point me in the right direction with these it would be greately appreciated
thanks