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February 26, 2015

February 26, 2015

Posted by **Anonymous** on Wednesday, October 3, 2012 at 8:07pm.

Repeat the problem for the case where the coefficient of kinetic friction between each box and the surface is 0.09.

a) find the acceleration

b) find the tension in the string

- Physics- Elena please help! -
**Elena**, Thursday, October 4, 2012 at 3:29pm1.

The acceleration of the system is

a=F/(m1+m2) = 58/(15+17)=1.81 m/s².

T1+T2

m1•a=T

m2•a= F-T,

T = m1•a = 15•1.81=27.5 N.

2. μ = 0.09,

T1=T2=T,

m1•a=T-F1(fr)=T- μ•N1=T- μ•m1•g

m2•a=F-T-F2(fr)= F-T- μ•N2= F-T- μ•m2•g

a•(m1+m2) = T- μ•m1•g+ F-T- μ•m2•g =F- μ•g(m1+m2),

a= {F- μ•g(m1+m2)}/ (m1+m2)=

={58 – 0.09•9.8(15+17)}/(15+17) =

=0.93 m/s²

T= m1•a+ μ•m1•g=m1(a+ μ•g) =

=15(0.93+0.09•9.8)=27.18 N

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