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March 31, 2015

March 31, 2015

Posted by **kelly** on Saturday, June 16, 2012 at 1:52pm.

In the previous problem if the coefficient of static friction is zero, to the nearest tenth of a degree, what would the incline angle have to be in order for the cord not to break?

- physics -
**Elena**, Saturday, June 16, 2012 at 4:34pmx: 0= m•g•sinα-T-F(fr),

y: 0 = - m•g•cos α +N.

F(fr) =k•N=k• m•g•cos α,

F(fr) = m•g•sinα – T,

k• m•g•cos α = m•g•sinα – T,

k= tan α – T/m•g•cos α =

=tan51º- 165/71•9.8•cos51 =

= 0.86.

If k=0,

tan α = T/m•g•cos α,

sin α/ cos α = T/m•g•cos α,

sin α = T/m•g =167/71•9.8 =0.24

α =13.88º

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