## Q. 8.1

BATTLE OF THE REVOLVING DOOR

GOAL Apply the basic definition of torque.

PROBLEM Two disgruntled businesspeople are trying to use a revolving door, which is initially at rest (see Fig. 8.3.) The woman on the left exerts a force of $625 \mathrm{~N}$ perpendicular to the door and $1.20 \mathrm{~m}$ from the hub’s center, while the man on the right exerts a force of $8.50 \times 10^{2} \mathrm{~N}$ perpendicular to the door and $0.800 \mathrm{~m}$ from the hub’s center. Find the net torque on the revolving door.

STRATEGY Calculate the individual torques on the door using the definition of torque, Equation 8.1,

$\tau = rF$      [8.1]

and then sum to find the net torque on the door. The woman exerts a negative torque, the man a positive torque. Their positions of application also differ.

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