Your are part of a team to help design the atrium of a new building.Your boss, t

Question

Your are part of a team to help design the atrium of a new building.Your boss, the manager of the project, wants to suspend a 6.2 kg sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be difficult to see how the sculpture is held up. The only place to fasten the fishing line is to a wooden beam which runs around the edge of the room at the ceiling.The fishing line that she wants to use will hold 10kg so she suggests attaching two lines to the sculpture to be safe. Each line would come from the opposite side of the ceiling to attach to the hanging sculpture. Her initial design has the first line making an angle of 12.67 degrees with the ceiling and the second line making an angle of 16.15 degrees with the ceiling. She knows you took physics, so she asks you if her design can work. How much force would the first line exert on the beam holding it up?

Type your answer, in Newtons, to one decimal place, into the box below. You may assume that g=9.8 m s-2

Explanation / Answer

Sculpture is in equilibrium.

hence Fnet on sculptur = 0

In horizontal direction,

T1 cos12.67 - T2cos16.15 = 0

T2 = T1 ( cos12.67 / cos16.15)

T2 = 1.0157 T1

In vertical,

T1 sin12.67 + T2sin16.15 - 6.2g = 0

T1 sin12.67 + (1.0157 T1) sin16.15 = 6.2 x 9.8

T1 ( 0.502) = 60.76

T1 = 121.04 N ......Ans

Tension in second string = 1.0157 x 121.04 = 122.94 N

Tension limit of string = 10g = 10 x 9.8 = 98 N

so it is not safe /

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