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Unformatted text preview: Name: Section: Practice Test 7 for Test 4 Assignment Due:Wednesday 4-30-2008 Practice Test Problem 7.1 In the intensive care unit at Arlington Memorial Hospital, the television sets are set in recessed areas high up the wall. Periodi- cally, the 60 kg Environmental Services worker must climb a ladder to reach the top of the TV to dust it. The 15 kg ladder is 3m long. Because of equipment in the room suspended from the foot of the bed, the angle the ladder makes with the floor is 70 ◦ . The wall the ladder rests on is very slippery, but the floor is not. There is a coefficient of static friction between the ladder and the floor of 0.5. (a)[6 pt(s) ]Draw the extended freebody diagram for the lad- der. For right now, just assume a position for the Environmental Services worker on the ladder (indicate it on your figure). (b)[5 pt(s) ]Write the equations for the horizontal ( bardbl ) and ver- tical ( ⊥ ) forces on the ladder. (c)[6 pt(s) ]Write the equation for the sum of the torques on the ladder. Solve your equations to find how high up the ladderthe ladder....
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This note was uploaded on 05/04/2008 for the course PHYS 2054 taught by Professor Stewart during the Spring '08 term at Arkansas.
- Spring '08