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Question 18M.1.SL.TZ1.7

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.SL.TZ1.7
Level SL Paper 1 Time zone TZ1
Command term Question number 7 Adapted from N/A
7.
[Maximum mark: 1]
18M.1.SL.TZ1.7

An increasing force acts on a metal wire and the wire extends from an initial length l0 to a new length l. The graph shows the variation of force with length for the wire. The energy required to extend the wire from l0 to l is E.

                                                        M18/4/PHYSI/SPM/ENG/TZ1/07

The wire then contracts to half its original extension.

What is the work done by the wire as it contracts?

A.     0.25E

B.     0.50E

C.     0.75E

D.     E 

[1]

Markscheme

C

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