1R10  Hooke's Law
            .10 Hooke's Law
            .30 Spring in Series and Parallel
1R20  Tensile and Compressive Stress
            .11 Elastic Limits
            .15 Young's Modulus
            .20 Bending Beams
            .60 Bologna Bottle
1R30  Shear Stress
            .40 Torsion Rod
1R40  Coefficient of Restitution
            .10 Coefficient of Restitution
1R50  Crystal Structure
            .20 Crystal Models
            .30 Snowflake Graph
            .40 Faults in Crystal

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