A Uniform Plank XY Is Supported by Two Equal 120-N

question 9

Multiple Choice

A uniform plank XY is supported by two equal 120-N forces at X and Y, as shown. The support at X is then moved to Z (half-way to the plank center) . The supporting forces at Y and Z are then:

• A) F_Y = 240 N, F_Z = 120 N
• B) F_Y = 200 N, F_Z = 40 N
• C) F_Y = 40 N, F_Z = 200 N
• D) F_Y = 80 N, F_Z = 160 N
• E) F_Y = 160 N, F_Z = 80 N