Question

Work on a fixture in an ascending elevator You are trying to move a light fixture into an apartment. There are hooks in the elevator so you hang the fixture on a hook with a chain. You don't want the fixture to touch the walls, so you attach a rope to the side and are pulling horizontally as shown, holding the fixture stationary with respect to the elevator. Note 0 degrees. chain rope fixture As the elevator ascends vertically, the magnitude of the force from the chain on the fixture as a function of the vertical position of the elevator, y, is F.0) - F. where F 187 N and y, 6.7 m. Using the fixture as your system, if the elevator goes from y=0 to y = 6.0 m, what is the work done by the force from the chain on the foxture? 641.9J 1pts You are correct. Your receipt no is 158-1122 Previous Tries The force from the horizontal rope as a function of y is where 93.5 N and y, 6.7 m. Using the fixture as your system, what is the work done by the rope as the elevator moves from y 0 to 6.0 m? 1pts Submit Answer Incorrect. Tries 2/15 Previous Tres

Answer 1

I consider the above given that Fcf (1) = F, etly F = 187, 9,=6.7 angle 8= 30° work done by force= (F. doro 1 (dy) coso -3/64 dy cos300 1187 = 187 X COS 30 6.7 =1878 6.7cos zo = 621.91 Joule

woolk done by Fe Hy) = (641.1 oule force from the horizontal rope forf (g) = f,e / F = 91.5, Y,= 6.7M noves from y=0 room shows the above picture at force is Perpendicular to noment of fixture at fyfly) is I to momentum non nchain n rope at this case the work done by the rope is zero work done = 0J2 'fixture