Consider a chain of length l 1 meter and linear mass

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2. Consider a chain of lengthl= 1 meter and linear mass densityδ(x) = 1 +x2(in units ofkg/m),wherexis the distance from the lighter end.(a) (3 pts) Find the centre of mass of the chain.
(b) (4 pts) Suppse the chain is initially lying horizontally on the ground. Compute the work neededto lift it vertically with the lighter end 1 meter above the ground and the heavier end justtouching the ground.
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Part 2. Multiple-Choice Answers – 12 questionsMark answers to the following problems in the Opscan sheet.Make sure that you have put your name on the Opscan sheet and have marked your studentnumber.1. (2 pts) A spring is relaxed in positionx= 0. If it is expanded toxit pulls back with the strengthF(x) =-7x. The work done when pulling it tox=-2 is:

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