Chapter 12 - Vectors and the Geometry of Space - Review - Exercises - Page 883: 14

$\approx 17 Nm$

$| \tau| =|r \times F|$ Here, $|F|=50 N$ and $|r|=40 cm =0.4 m$ In this question $ \theta =60 ^\circ$ because $F$ makes an angle with $r$ a acute angle. $| \tau| =|r \times F|$ $| \tau| =(0.4) (50) sin 60^\circ$ $| \tau|\approx 17.32 Nm$ or, $\approx 17 Nm$