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Exercise 10.3

A square metal plate 0.180 ${\rm m}$ on each side is pivoted about an axis through point ${\rm O}$ at its center and perpendicular to the plate

Part A

Calculate the net torque about this axis due to the three forces shown in the figure if the magnitudes of the forces are $F_1$ = 19.0 ${\rm N}$ , $F_2$ = 16.4 ${\rm N}$ , and $F_3$ = 15.8 ${\rm N}$ . The plate and all forces are in the plane of the page. Take positive torques to be counterclockwise.

ANSWER:

$\tau$ =

1.78
Correct

${\rm N} \cdot {\rm m}$

Exercise 10.20 for Physics 2

A string is wrapped several times around the rim of a small hoop with radius 8.00 ${\rm cm}$ and mass 0.180 ${\rm kg}$ . The free end of the string is held in place and the hoop is released from rest as shown in the figure