Hooke's law describes a certain light spring of unstressed length36.0 cm. When one end is attached to the top of a door frame and a6.60 kg object is hung from the other end, the length of the springis 41.50 cm.

(a) Find its spring constant.
11.18 kN/m <-- i found this and its right

(b) The load and the spring are taken down. Two people pull inopposite directions on the ends of the spring, each with a force of190 N. Find the length of the spring in this situation.

Not sure how to do this one....
Thanks in advance!

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Hooke's law describes a certain light spring of unstretched length31.0 cm. When one end is attached to the top of a door frame, and a7.60-kg object is hung from the other end, the length of the springis 40.00 cm.
(a) Find its spring constant.
1. kN/m

(b) The load and the spring are taken down. Two people pull inopposite directions on the ends of the spring, each with a force of150 N. Find the length of the spring in this situation.

Hooke's law describes a certain light spring of unstretchedlength32.0 cm. When one end is attached tothe top of a door frame,and a 7.20-kgobject is hung from the other end, the length of thespring is42.50 cm.

(a) Find its spring constant.
1 kN/m

(b) The load and the spring are taken down. Two people pullinopposite directions on the ends of the spring, each with a forceof170 N. Find the length of the springin this situation.
2 m

The method by which the massive lintels (top stones) were lifted tothe top of the upright stones at Stonehenge has long been debated.One possible method was tested in a small Czech town. A concreteblock of mass 5413 kg was pulled up along two oak beams whose topsurfaces had been debarked and then lubricated with fat (seeFig.10-57). The beams were 10 m long, and each extended from theground to the top of one of the two upright pillars onto which theblock was to be raised. The pillars were 3.9 m high; thecoefficient of static friction between block and beams was 0.22.The pull on the block was via ropes wrapped around it and aroundthe top ends of two spruce logs of length 4.5 m. A platform wasstrung at the opposite end of each log.When enough workers sat orstood on a platform, the attached spruce log would pivot about thetop of its upright pillar and pull one end of the block a shortdistance up a beam. For each log, the rope holding the block wasapproximately perpendicular to the log; the distance between thepivot point and the point where the rope wrapped around the log was0.70 m. Assuming that each worker had a mass of 85 kg, find thesmallest number of workers needed on the two platforms so that theblock begins to move up along the beams. (About half this numbercould actually move the block by moving first one end of it andthen the other.)

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