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2017 WAEC Physics Theory A spiral spring has a length of 14cm when a force of 4N is hung...

Physics
WAEC 2017

A spiral spring has a length of 14cm when a force of 4N is hung on it. A force of 6N extends the spring by 4cm. Calculate the unstretched length of the spring

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Explanation

Using hookes law

\(\frac{F_1}{e_1} = \frac{F_2}{e_2}\)

but e\(_1\) = l\(_1\) = l\(_o\)

\(\frac{F_1}{l_1 - l_o}\) = \(\frac{F_2}{e_2}\)

\(\frac{4}{14 - \_o}\) = \(\frac{6}{4}\);    16 = 6(14 - \(_o\))

14 = 84 - 6\(l_o\);  16 - 84 = -6\(l_o\)

\(l_o = \frac{-68}{-6}\) = 11.33cm

 


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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free