Question: The 20-kg roll of paper has a radius of gyration kA = 90 mm about an axis passing through point A. It is pin supported at both ends by two brackets AB. If the roll rests against a wall for which the coefficient of kinetic friction is muk = 0.2 and a vertical force F = 30 N is applied to the end of the paper, determine the angular acceleration of the roll as the paper unrolls. Problem 17-69 from: Engineering Mechanics: Dynamics, 14th edition Russell C. Hibbeler Thank you guys for watching. If you would like to donate use the link below to my Patreon: Please let me know if you have any comments or suggestions and also if you have any other problem you would like to go over with.