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Re: hello nerds i need some halp

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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 02:54 PM
A large 3.00×104 L aquarium is supported by four wood posts at the corners. Each post has a square 4.20 cm x 4.20 cm cross section and is 90.0 cm tall.


By how much is each post compressed by the weight of the aquarium?

solve it and make it clear to follow so i can understand

here is what i tried to do, volume of aquarium*density of water (1000) *gravity/ 0.042^2 *4


i got the wrong answer
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exterminator6557 is not online. exterminator6557
Joined: 23 Feb 2013
Total Posts: 262
23 Apr 2017 02:57 PM
The resistance of the wood is needed


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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 02:57 PM
its douglas fir
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exterminator6557 is not online. exterminator6557
Joined: 23 Feb 2013
Total Posts: 262
23 Apr 2017 03:00 PM
believe it is 2.5 mm


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exterminator6557 is not online. exterminator6557
Joined: 23 Feb 2013
Total Posts: 262
23 Apr 2017 03:02 PM
(3 # #### # ### # ########### # 0.0104)
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exterminator6557 is not online. exterminator6557
Joined: 23 Feb 2013
Total Posts: 262
23 Apr 2017 03:02 PM
rip filter sorry


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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 03:02 PM
it isn't
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TheLastingMillennia is online. TheLastingMillennia
Joined: 27 Aug 2015
Total Posts: 1264
23 Apr 2017 03:08 PM
if i am not mistaken

the mass of the aquarium is density of water * volume = 3.00*104L

so then area of one post is .051m*.051m=0.0026m^2

so then the total area of the post is 0.0026*4=0.0104

(3*10^4 * 9.8 * 0.9)/(10^10 * 0.0104)

you get 0.0025m


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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 03:13 PM
@mil

incorrect
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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 04:08 PM
bomp
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isseman6 is not online. isseman6
Joined: 16 Feb 2016
Total Posts: 3224
23 Apr 2017 06:21 PM
@thelast

I already solved its 3.2 mm, I read up on young modulus and you came pretty close except you messed up with the area it should be (0.042)^2*4
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TheLastingMillennia is online. TheLastingMillennia
Joined: 27 Aug 2015
Total Posts: 1264
23 Apr 2017 09:57 PM
oh damn

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