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Posted by **HANNE** on Sunday, October 28, 2012 at 5:34am.

1)Find the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m

2)What is the speed of the unknown nucleus immediately after such a collision?

ANSWER I GOT:

•physics-mechanics-collisions,momentum, impulse - bobpursley, Saturday, October 27, 2012 at 6:26am

Momentum:

p is mass of a proton

M is the mass of the nuclei

p*2.4E7=Mv' + p(-2.1E7)

KEnergy:

1/2 p (2.4E7)^2=1/2 M v'^2 + 1/2 p (-2.1E7)^2

Two equations, two unknowns: Let algebra go to work. Solve for v' in the first equation in terms of M

then, put that expression for v' into the second equation. It will work out.

MY CALCULATIONS:

so : v' = 7.52679E-20/M?

and, M= 5.66525677E-39

V' = 7.52679E-20/5.66525677E-39 =

1.328587618E19

is this correct???

please help me. i don't reallly understand this question...

- physics-mechanics-collisions,momentum, impulse -
**bobpursley**, Sunday, October 28, 2012 at 11:44amV' is correct.

I am certain M is wrong, it is smaller than either an electron or proton, which cannot be. Recheck your work on that.

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