2.) If the work required to stretch a spring 1 ft beyond its natural length is 12 ft-lb, how much work is needed to stretch it 9 in. beyond its natural length? (A) 2.35 ft-lb (C) 5.65 ft-lb (B) 3.45 ft-lb (D) 6.75 ft-lb

2.) If the work required to stretch a spring 1 ft beyond its natural length is 12 ft-lb, how much work is needed to stretch it 9 in. beyond its natural length? (A) 2.35 ft-lb (C) 5.65 ft-lb (B) 3.45 ft-lb (D) 6.75 ft-lb

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

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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2.) If the work required to stretch a spring 1 ft beyond its
natural length is 12 ft-lb, how much work is needed to stretch
it 9 in. beyond its natural length?
(A) 2.35 ft-lb
(C) 5.65 ft-lb
(B) 3.45 ft-lb
(D) 6.75 ft-lb

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