Question

The exit of a warehouse is a thick steel fire door 10 feet high (3.05m) and 6.0 feet wide (1.83m) weighing about 2,000 pounds (8,890N). In a movie scene, an actor is to flee from this building and close the door (initially at rest), thus sealing a mutant creature inside the building. You estimate that the actor can push on the door with a force of 200 pounds (890N). The door, which has a moment of inertia of 1/3ML² around its hinges, needs to rotate 120° for it to close completely. What is the shortest amount of time in which the actor can close the door?

Answer 1

L-1.53m 1-1.53 P= Id T = Fr 890 X 1.83 = 1x 8890 = (-83)*xa 890 x 3x9.8 889071-83 a = 1.608 radly 0= 120 = 24 red. 3 't | | ܪܨܒܝܢܗ ܝ. .ܝ **1082 to ayol.com t-14541.605 13 V 371. God → 3.97 -7 1-99 second, 47 3 XI. GOS Scanned with CamScanner