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Physics help anyone?

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chapz
Posts: 10182 - Karma: 66
this has been driving me crazyyyyy

were doing mechanics now, collisions mostly. so p=mv, ΣPb=ΣPa, F^t=M^V


In a physics lab, a small cube slides down a frictionless incline as shown, and collides at the bottom (where it is now moving horizontally) with a cube that is only one-half its mass. If the incline is 30 CM high and the table is 90 CM off the floor. where does each cube land?

the teacher gave us that the big cube lands 30 CM away. Thats all, does anyone know how to solve this?
Jan 22 2008 8:52PM
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chapz
Posts: 10182 - Karma: 66
anybody?
Jan 22 2008 9:05PM
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4-Front
Posts: 5306 - Karma: 199
1.  Find the speed at the point before is leaves the table.  Probably by using a energy formula
2.  Then it is just a kinematics problem

check out physicsforum.com for lots more help
Jan 22 2008 9:20PM
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chapz
Posts: 10182 - Karma: 66
shit i havent heard of anything you wrote.... thanks though, ill check the forum
Jan 22 2008 9:28PM
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Arabian.
Posts: 9640 - Karma: 150
Calculate free fall speed for small cube before it hits incline ( I am assuming it drops down from the table? Explain the question more precisely.)

Then calculate speed of the cube on the frictionless incline with gravity (9.8 x angle/360)

Then, I forget how to do the last part. Forgot how that works. I don't know if this is what you're asking for, but hey. 
Jan 22 2008 9:33PM
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chapz
Posts: 10182 - Karma: 66
well i can get its velocity as it leaves the table, because we assume its falling at a constant rate of freefall, so i make the vi vf a s t chart and plug in for Vf. i would use the displacement as 30cm, the Vi as 0 and the acceleration as -9.8. then i get Vf, but its there that im stuckk.
Jan 22 2008 9:38PM
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