- #1
Karol
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Homework Statement
A spring with a constant k=10[N/m] is attached with a long rope to a weight of 0.05 kg. they both lie horizontally on the table. the string is stretched 10 cm and released and the weight travels 40 cm on the table until it halts. what is the coefficient of friction
Homework Equations
Elastic energy of spring:[itex]E_P=\frac{1}{2}kx^2[/itex]
The Attempt at a Solution
Conservation of energy:
[tex]\frac{1}{2}kx^2=mg\mu\cdot \triangle x[/tex]
[tex]\frac{1}{2}10\cdot 0.1^2=0.05 \cdot 10 \cdot \mu \cdot 0.4 \rightarrow \mu=0.25[/tex]
The answer should be μ=0.2