ياشباب ابي احد يساعدني في حل المسائل هذة او تمون عند احد ضروري
(1-47)
a shaft 6.00cm in diameter is being pushed axially through a bearing sleeve 6.02 cm in diameter and 40 cm long. The clearance assumed uniform ,is filled with oil whose properties are V=0.003 m/s and SG=0.88 Estimate the force required to pull the shaft at a steady velocity of 0.4 m/s

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Ex2 .
A space between two square flat plate is filled with oil. eash side measures 60 cm the thichnes of oil film is 1 mm .when the plates are inclined 30 to the horizontal . find the velocity with which the upper plate slides over the lower plate .the weight of upper plate is 32N oil viscosity is 0.05 N.s/m