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September 21, 2014

September 21, 2014

Posted by **Megan** on Wednesday, October 17, 2012 at 11:03am.

- Physics URGENT!!! -
**Elena**, Wednesday, October 17, 2012 at 11:16amx: m•v1=(m1+m2) •v(x),

y: m•v2 =(m1+m2) •v(y),

v(x)= m•v1/(m1+m2),

v(y) =m•v2 /(m1+m2),

v=sqrt[v(x)²+v(y)²],

φ =arctan {v(y)/v(x)}.

∆K = Kf −Ki =

=(m1•v²/2 +m2•v²/2) - (m1 +m2) •v²/2.

mechanical energy -> thermal energy, sound, etc

- Physics URGENT!!! -
**Megan**, Wednesday, October 17, 2012 at 11:26amCan you give me the values so I can compare, I don't think I am getting the right values!

- Physics URGENT!!! -
**Elena**, Wednesday, October 17, 2012 at 11:36amx: m1•v1=(m1+m2) •v(x)

y: m2•v2 =(m1+m2) •v(y)

v(x)= m1•v1/(m1+m2) =75•6/(75+82)=2.87 m/s

v(y) =m2•v2 /(m1+m2)= 82•5/(75+82)=2.66 m/s

v=sqrt[v(x)²+v(y)²] =3.91 m/s

φ =arctan {v(y)/v(x)} =42.8⁰

∆K = Kf −Ki =(m1•v²/2 +m2•v²/2) - (m1 +m2) •v²/2 =

=(75•36/2 +82•25/2) –(75+82) •3.91²/2=

=1350 +1025 -1200 =1175 J

- Physics URGENT!!! -
**Megan**, Wednesday, October 17, 2012 at 11:41amThank you!

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