1 A spring of natural length 50 cm and modulus of elasticity \(\lambda\) newtons has an elastic potential energy of 4 J when compressed by 5 cm . Find the value of \(\lambda\) Circle your answer.
[0pt] [1 mark]
8168001600 A force of magnitude 7 N acts at each end of a rod of length 20 cm , forming a couple. The forces act at right angles to the rod, as shown in the diagram below.
\includegraphics[max width=\textwidth, alt={}, center]{4975a2a9-1e45-44b4-b525-fc902627d03e-03_348_610_447_715} Find the magnitude of the resultant moment of the couple.
Circle your answer.
[0pt] [1 mark]
1.4 N m
2.8 Nm
140 Nm
280 Nm