Hooke\'s law describes a certain light spring of unstretched length36.0 cm. When

Question

Hooke's law describes a certain light spring of unstretched length36.0 cm. When one end is attached tothe top of a door frame, and a 8.20-kgobject is hung from the other end, the length of the spring is48.00 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 of170 N. Find the length of the springin this situation.
2 m (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 of170 N. Find the length of the springin this situation.
2 m

Explanation / Answer

a) Spring constant             k = mg/x Here m = 8.20 kg            g=9.8 m/s2            x= 0.48 m - 0.36m b) The length of the spring is             L = 0.36cm + F/k Here F = 170 N Substitute the values.            x= 0.48 m - 0.36m b) The length of the spring is             L = 0.36cm + F/k Here F = 170 N Substitute the values.

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