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YPang
United States4024 Posts
It asks me 1. to Determine the velocity of the 0.30 kg puck after the collision. Which i got, the answer is 1.02 m/s However when it asks me to Find the fraction of kinetic energy lost in the collision. so basically i did .5(M1)(V1)^2 subtract .5(m2)(v2)^2.......... it was wrong.. I dunno what to do... I tried doing ((.5(.2m/s)(1.9m/s)^2)) - ((.5)(.3)(1.02)^2)) = .205..... and my answer was wrong... I dunno how to find the kinetic energy lost..    | ||
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Hittegods
Stockholm4640 Posts
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blapsd
England121 Posts
but you forgot to include the kinetic energy of the 0.2kg puck when you did you calculation for the total kinetic energy afterwards. Kinetic energy afterwards = (0.5 x 0.3 x (1.02)^2) + (0.5 x 0.2 x (0.9)^2) so Kinetic Energy lost is Total KE before - Total KE after ill let you do the rest..... Hope i helped | ||
micronesia
United States24494 Posts
The wording for the second part is a bit ambiguous but I think they want you to do... (Ebefore-Eafter)/Ebefore If that doesn't work then just try the difference like you were before | ||
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YPang
United States4024 Posts
On February 03 2009 11:47 blapsd wrote: You are right the total kinetic energy before the collision = (0.5 x 0.2 x (1.9)^2) but you forgot to include the kinetic energy of the 0.2kg puck when you did you calculation for the total kinetic energy afterwards. Kinetic energy afterwards = (0.5 x 0.3 x (1.02)^2) + (0.5 x 0.2 x (0.9)^2) so Kinetic Energy lost is Total KE before - Total KE after ill let you do the rest..... Hope i helped EDIT: yeah i got 1.37 for speed of 0.3 puck also this worked thanks | ||
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blapsd
England121 Posts
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Hypnosis
United States2061 Posts
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ilovehnk
475 Posts
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micronesia
United States24494 Posts
On February 03 2009 12:02 Hypnosis wrote: oh HAHA oh ahhhh lol ahahahahah omg stop it hahaha. just wait until you take physics in college . (unless that is college and its some beginner physics :D) What the heck is your point? | ||
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Jonoman92
United States9101 Posts
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imperfect
Canada1652 Posts
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GHOSTCLAW
United States17042 Posts
On February 03 2009 13:15 Jonoman92 wrote: He thinks he's hot stuff cuz he took some fancy mathmatics class. except we know that micronesia is king of kings when it comes to this stuff on tl.net xD | ||
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g girl
South Africa4 Posts
Now it asked me what the velocity of the truck was after the collision and i got 20.37m/s north The it asked me to calculate the loss in kinetic energy during the collision... the answer i got was wrong...???? | ||
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g girl
South Africa4 Posts
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blapsd
England121 Posts
I didn't round off too accurately so I might be a little out | ||
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Klockan3
Sweden2866 Posts
On February 03 2009 12:02 Hypnosis wrote: oh HAHA oh ahhhh lol ahahahahah omg stop it hahaha. just wait until you take physics in college . (unless that is college and its some beginner physics :D) Not everyone takes physics in college. | ||
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Marradron
Netherlands1586 Posts
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YPang
United States4024 Posts
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micronesia
United States24494 Posts
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g girl
South Africa4 Posts
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