Question
10-8. The bar AB in Fig. P 10-8 weighs 100 lb and rotates in a vertical plane
about a horizontal axis through A. When the bar is in the position indicated, the
tension in the spring is 20 lb. As the bar rotates 90° clockwise the work done on
it is -100 ft-lb. Determine the modulus of the spring.
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Transcribed Image Text

10-8. The bar AB in Fig. P 10-8 weighs 100 lb and rotates in a vertical plane about a horizontal axis through A. When the bar is in the position indicated, the tension in the spring is 20 lb. As the bar rotates 90° clockwise the work done on it is -100 ft-lb. Determine the modulus of the spring.