Training Polymer Chemistry-CT-homework 3 by Qian Zhou https://padlet.com/qianzhou1975/vumzju9fiy3t en-us 2016-11-22 10:04:27 UTC 2025-05-03 02:47:17 UTC hello@padlet.com Rick https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/140759438 Optional Homework lesson 3

The stress at 20% elongation is approximately 7MPa, that is 7 n/mm2. You have 1mx20mm of surface, that is 1000x20= 20 000mm2.
If you want to calculate the Force, you have to do A*δ
F= 20000*7= 140 000 N
If you want to have the mass, you devide it by g(9,81m/ss)
M=140000/9,81= 14 276 kg 

]]> 2016-11-30 10:55:08 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/140759438 Denise idpraet https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141232964 Treksterkte LDPE: 11.7 mPa = 11.7 mN/m^2

m^2= 1*0.002= 0.002

N=0.002*11.7*10^3=23.4 

23.4/9.81=2.4 kg _�U�퐧�

]]> 2016-12-01 19:19:38 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141232964 Rowan https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141539077 Optional assignment lecture 3
Estimate the allowed weight of your plastic bag can hold.
 
δ=F/A0
δ=m×g/A0
 
m=?
m= δ×A0/g
 
A0=1×20×10-6=2×10-5 m2
g=9,81 m/s2
 
E= δ/e
125= δ/12
δ=1500
 
m=1500×2×10-5/9,81
m=3,06 ×10-3 kg
]]> 2016-12-03 10:46:20 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141539077 Assignment van Tom https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962324 2016-12-06 10:26:10 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962324 Hi Qian, here my assignment of lecture 3. I hope you can read it! Kind regards, Jesse de Heij! :) https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962581  ]]> 2016-12-06 10:27:29 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962581 Hello this is the assigment of Tom https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962674 2016-12-06 10:28:07 UTC https://padlet.com/qianzhou1975/vumzju9fiy3t/wish/141962674