10. A rough casting for a rotor weighs 450 lb. and is mounted on centres 46 in. apart, ready for machining; it is given static balance by two masses A and B in planes which are situated 20 in. and 16 in. respectively on either side of the plane containing the mass centre. The weights of the masses A and Bare 20 lb. and 24 lb. respectively, and their mass centres are at 90° to each other relative to the axis of the casting, and at 15 in. and 18 in. radius respectively. Determine the eccentricity of the mass centre of the casting, its position relative to that of mass A, and the forces on the centres when the rotor with attached masses A andB is run at 50 r.p.m. (U. Lond.)

10. A rough casting for a rotor weighs 450 lb. and is mounted on centres 46 in. apart, ready for machining; it is given static balance by two masses A and B in planes which are situated 20 in. and 16 in. respectively on either side of the plane containing the mass centre. The weights of the masses A and Bare 20 lb. and 24 lb. respectively, and their mass centres are at 90° to each other relative to the axis of the casting, and at 15 in. and 18 in. radius respectively. Determine the eccentricity of the mass centre of the casting, its position relative to that of mass A, and the forces on the centres when the rotor with attached masses A andB is run at 50 r.p.m. (U. Lond.)

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter8: Centroids And Distributed Loads

Section: Chapter Questions

Problem 8.91P: What is the ratio L/R for which the uniform wire figure can be balanced in the position shown?

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