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

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Definitions:

Family Support

Financial contributions, typically governed by legal or agreement, made to support the wellbeing and upkeep of family members.

Economic Value

The significance of a good or service for individuals or society in terms of its ability to satisfy needs or wants.

25-year Annuity

A financial product that provides a series of payments made at equal intervals over 25 years.

Compounded Semi-annually

A method of computing interest where the interest is calculated and added to the principal twice a year.