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The $5-$lb packages ride on the surface of the conveyor belt as shown in $($Figure $1).$ The coefficient of static friction between the belt and a package is $0\mathrm{.}35.$

igure

$1$ of $1$

If the belt starts from rest and its speed increases to $2f\frac{t}{s}$ in $2$ s $,$ determine the maximum angle $$ so that none of the packages slip on the inclined surface $AB$ of the belt.

Express your answer in degrees to three significant figures.

$=$

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Part B

At what angle $$ do the packages first begin to slip off the surface of the belt after the belt is moving at its constant speed of $2f\frac{t}{s}?$ Neglect the size of the packages.

Express your answer in degrees to three significant figures.

$=$