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What is the spring stiffness?

by ohheytai
Tags: spring, stiffness
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Oct7-10, 06:22 PM
P: 85
In outer space a rock of mass 4 kg is attached to a long spring and swung at constant speed in a circle of radius 6 m. The spring exerts a force of constant magnitude 720 N. What is the speed of the rock?

i found the speed it is 32.8 m/s

part 2:
The relaxed length of the spring is 5.7 m. What is the stiffness of this spring?

thats what i have no idea about could someone help lead me in the direction of solving it or show me how? please and thanks!

2. Relevant equations
i used F=mv^2/r to get speed
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Oct7-10, 06:50 PM
P: 709
Hooke's law:

x is the change in length of the spring due to a force F.
K is the the spring constant or "stiffness"
Oct7-10, 06:58 PM
P: 85

Oct7-10, 07:00 PM
P: 709
What is the spring stiffness?

what are you talking about it changes from 6m to 5.7m, there is no material in the world with no elasticity.

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