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You hang a mass Mfrom a spring, which stretches an amount S1. Then you cut the spring in half, and hang a mass Mfrom one half. How much does the half-spring stretch? (a) 2s1, (b) S1,(c)s1/2.

Short Answer

Expert verified

The half-spring stretches byS1/2.

Step by step solution

01

Stating given data

A mass M is hung from a string and the initial displacement is S1.

02

Defining spring constant and displacement

The spring constant k represents the stiffness of the spring. Stiffer (more difficult to stretch) springs have higher spring constants. The displacement of an object is a measurement of the distance that describes the change from a normal or equilibrium position.

The spring constant k of a spring doubles if it is cut in half.

The displacement of a spring when a force F is applied to it is defined using the following formula:

x=Fk

03

Determining change in spring displacement

Since the spring constant doubles if the length is halved, the new spring constant is 2k. if the initial spring constant was k, 2k.

From equation (I), the change in displacement of the spring is

x=F2k=12Fk

Substitute the displacement S1for Fkin the above equation.

x=12s1=s12

Hence, the new displacement is s12.

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