- #1
korec123
- 8
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Sorry for my english at the beginning. :) I am not really into academic(physic) english.
1. Homework Statement
Picture of problem : http://screenshot.sh/ouZAbUeL9Qzmj
We have got a desk,mass m1, length L1 and thickness d, and L1>>d. One of it's ends is angled by 45 degree. At the beginning it is put on the other desk which thickness is also d and mass is m2.
I have to find final velocity of the second desk, this one which is lying on the table.
We skip friction.
I also have information at the end of the task that Moment of inertia of thin long rod, length l, and mass m is 1/12ml^2.
Io=1/12ml^2
F=ma.
I don't really have any idea how to approach this task. What i could is just simply mark all the forces, just what i do every time when i do this kind of question (i mean, i have some mass and i have to find accelerate, whole basically based on 2nd Newton law's), but it didnt help.
I ve only found that sin of the angle between first desk and the table is sin=d/L1-d.
The biggest problem i think is that i don't know how to use info about moment of inertia in this question.
If you can explain to me, how to approach this one and how to use moment of inertia i would be grateful.
Thanks in advance,
1. Homework Statement
Picture of problem : http://screenshot.sh/ouZAbUeL9Qzmj
We have got a desk,mass m1, length L1 and thickness d, and L1>>d. One of it's ends is angled by 45 degree. At the beginning it is put on the other desk which thickness is also d and mass is m2.
I have to find final velocity of the second desk, this one which is lying on the table.
We skip friction.
I also have information at the end of the task that Moment of inertia of thin long rod, length l, and mass m is 1/12ml^2.
Homework Equations
Io=1/12ml^2
F=ma.
The Attempt at a Solution
I don't really have any idea how to approach this task. What i could is just simply mark all the forces, just what i do every time when i do this kind of question (i mean, i have some mass and i have to find accelerate, whole basically based on 2nd Newton law's), but it didnt help.
I ve only found that sin of the angle between first desk and the table is sin=d/L1-d.
The biggest problem i think is that i don't know how to use info about moment of inertia in this question.
If you can explain to me, how to approach this one and how to use moment of inertia i would be grateful.
Thanks in advance,
