Problem 12.71 A 69.0-kg painter is on a uniform 23-kg scaffold supported from ab
ID: 1409119 • Letter: P
Question
Problem 12.71 A 69.0-kg painter is on a uniform 23-kg scaffold supported from above by ropes. There is a 3.5-kg pail of paint to one side, as shown (Figure 1) . Part A Can the painter walk safely to both ends of the scaffold? Yes No SubmitMy AnswersGive Up Correct Part B How close to the right end can he approach safely? Express your answer using two significant figures. dright = cm SubmitMy AnswersGive Up Part C How close to the left end can he approach safely? Express your answer using two significant figures. dleft = cm SubmitMy AnswersGive Up
Explanation / Answer
Summation of Moment at one end of the rope.
Since it is a uniform scaffolding supports, therefore, the center of gravity of the load is at the center of the scaffolds.
9.81(69)x = 23(9.81)(2) + (3.5)(9.81)(3)
x = 0.8188 m ---distance in reference to the rope end.
= 81.88cm
Therefore, the painter can still able to stand at the edge of the scaffolds. So the distance is zero.
distance = 0.