$5$

Formula

$1$ point

Two blocks, A and B $,$ are attached to one another by a rope that passes over a frictionless pulley as shown in the figure; the mass of block $\backslash ($ A $\backslash )$ is $4$ kg and the mass of block $\backslash ($ B $\backslash )$ is $7$ kg $.$ The coefficient of kinetic friction between the block $\backslash ($ A $\backslash )$ and the surface is $0\mathrm{.}17.$ The pulley can be modeled as a uniformly dense solid cylinder with a radius of $3\mathrm{.}2$ cm and a mass of $3$ kg $.$ What is the magnitude of the tension $($in N $)$ in the rope between block B and the pulley if $\backslash (\backslash$theta$=31^\{\backslash$circ$\}\backslash )?$