A businessman enters the same revolving door on the right, pushing with 524 N of
ID: 1446207 • Letter: A
Question
A businessman enters the same revolving door on the right, pushing with 524 N of force directed perpendicular to the door and 0.533 m from the hub, while a boy exerts 400 N perpendicular to the door, 1.58 m to the left of the hub. (Indicate the direction with the sign of your answer.) Find the torques exerted by each person. Reread the description and make sure you have matched up the information with the right people tau_man = Reread the description and make sure you have matched up the information with the right people Find the net torque on the door. Your expression is valid, but since at least one of your answers to part (a) is wrong, this answer is wrong, too N. mExplanation / Answer
Torque = rxF
Torque by the child:
Tboy = (1.58 m)(400 N) = 632 Nm
Torque by the businessman:
Tman = (0.533)(524) = 279.3 Nm
Net torque:
TN = (632 N) - (279.3) = 352.7 Nm
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