roblem $3.(5$ points$)$

A full journal bearing has a journal diameter of $28$ mm $.$ The bore has a diameter of $28\mathrm{.}04$ mm $.$ The bearing is $28$ mm long. The journal runs at a speed of $960re\frac{v}{m}in$ and carries a radial load of $1\mathrm{.}3$ kN $.$ SAE $60$ oil is used for lubrication. At an operating temperature of $70C,$ find the minimum film thickness and the total oil$-$flow rate.

Problem $4.(5$ points$)$

A $20$ pressure angle spur pinion with a pitch radius of $40$ mm is rotating in the direction shown, driving a gear with $60$ mm pitch radius. The addendum is $4$ mm and the dedendum is $5$ mm $.$ Draw $($on the same drawing shown$)$: the pitch circles, the addendum circles, the dedendum circles, the base circles, the line of action, the initial point of contact $(a),$ and the final point of contact $(b).$ Is there an interference? Explain.