Figure 9-54 shows the massiveshield door at a neutrontest facility at Lawrence Livermore Laboratory;this is the world's heaviest hinged door. The door has a mass of 44,000 kg, a rotational inertia about its hinge line of 8.7 X 104 kg m2 and a width of 2.4 m. What steady force, applied at its outer edge at right angles to the door, can move it from rest through an angle of 90° in 30 s?

Simran Bhatia , 9 Years ago

Grade 11