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Figure 9-54 shows the massive shield door at a neutron test 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 10 4 kg m 2 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?

Figure 9-54 shows the massive  shield door at a neutron  test 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?

Grade:11

2 Answers

Aditi Chauhan
askIITians Faculty 396 Points
8 years ago
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236-94_1.PNG
Adarsh
733 Points
8 years ago
Sir how you get ω = dθ/dt = 900(2π/1800)/30s
as dθ = 900 = π/2

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