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  16. An 800-N billboard worker stands a 4.0-m scaffold weighing

Question :   16. An 800-N billboard worker stands a 4.0-m scaffold weighing : 2102169

 

16. An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550 N in that rope?

A. 1.4 m

B. 2.0 m

C. 2.5 m

D. 2.7 m

17. A woman who weighs 500 N stands on an 8.0-m-long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?

A. 4.0 m

B. 2.0 m

C. 2.7 m

D. 1.6 m

18. A uniform, horizontal beam of length 6.0 m and weight 120 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60? with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?

A. 35 N

B. 69 N

C. 60 N

D. 120 N

19. A uniform 1.0-N meter stick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50 cm position, and a 3.0-N weight is suspended from the 60 cm position. What is the tension in the string attached at the 100-cm end of the stick?

A. 1.9 N

B. 3.0 N

C. 3.5 N

D. 4.0 N

20. A 2.00-m by 4.00-m uniform sheet of plywood is in a coordinate system with the origin at its center, the x-axis along the longer dimension of the sheet is positive to the right and the y-axis along the shorter dimension is positive upwards. The section of the plywood in the 3rd quadrant is sawed off and the resulting piece is then glued squarely over the 4th quadrant portion of the plywood with glue of negligible weight.What are the x- and y-coordinates of the resulting center of gravity for this arrangement?

A. (0 m, 1.0 m)

B. (0.50 m, 0 m)

C. (1.0 m, –0.50 m)

D. (1.0 m, 0 m)

 

Solution
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