Answer to Question #232780 in Mechanical Engineering for jhy

Question #232780

Three springs with the same constant connected in series and parallel, and a 1-kg object attached at one end of a spring, as shown in figure below. Spring constant is k1 = k2 = k3 = 250 N/m. What is the change in length of the three springs? Acceleration due to gravity is g = 9.806 m.s-2


1
Expert's answer
2021-09-04T01:00:54-0400

Solution;


Given;

k1=k2=k3=250N/mk_1=k_2=k_3=250N/m

Object mass,m=1kgm=1kg

Acccelaration due to gravity,g=9.806ms2g=9.806ms^{-2}

Hence ;

Object weight,w=m×g=1×9.806=9.806Nw=m×g=1×9.806=9.806N

Find the equivalent constant;

k12=k1+k2=250+250=500N/mk_{12}=k_1+k_2=250+250=500N/m

Such that k12k_{12} and k3k_3 are in series ,and whose equivalent is ;

1k=1k3+1k12=1250+1500=3500\frac1k=\frac{1}{k_3}+\frac{1}{k_{12}}=\frac1{250}+\frac{1}{500}=\frac{3}{500}

k=5003k=\frac{500}{3} N/m

To find change in length in the springs,Δx\Delta x ;

Δx=wk=9.806×3500\Delta x=\frac{w}{k}=9.806×\frac3{500}

Δx=0.058836m\Delta x=0.058836m








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