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.)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.

Question

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.)

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