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Unformatted text preview: the torque. 012 qfull 00610 2 3 0 moderate math: LLNL door and torque Extra keywords: (HR-243:53p) 2. The shield door of the neutron test facility at Lawrence Livermore National Laboratory (where they design the bombs) is (or was), according to HRW-243, the world’s most massive hinged door: mass 44 , 000 kg, rotational inertia about its hinge axis 8 . 7 × 10 4 kg m 2 , door width 2 . 4 meters. Assuming zero friction, what constant force perpendicular to the door at its outer edge is needed to move the door 90 ◦ in 10 s starting from REST ? Show your calculations. Could you open this door in the time given? Would you want to open this door?...
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This note was uploaded on 12/14/2011 for the course PHY 2055 taught by Professor Dr.acost during the Fall '11 term at University of Florida.
- Fall '11