(a)
The moment about origin
(a)

Answer to Problem 3.19P
The moment about origin
Explanation of Solution
Write an expression to calculate the moment of the force at the origin
Here
Write an expression to represent force vector.
Here,
Write an expression to represent position vector of point
Here,
Write an expression to calculate the moment of force.
Conclusion:
Substitute
Thus, the moment about origin
(b)
The moment about origin
(b)

Answer to Problem 3.19P
The moment about origin
Explanation of Solution
Write an expression to calculate the moment of the force at the origin
Write an expression to represent force
Write an expression to represent position vector of point
Write an expression to calculate the moment of force.
Conclusion:
Substitute
Thus, the moment about origin
(c)
The moment about origin
(c)

Answer to Problem 3.19P
The moment about origin
Explanation of Solution
Write an expression to calculate the moment of the force at the origin
Write an expression to represent force vector.
Write an expression to represent position vector of point
Write an expression to calculate the moment of force.
Conclusion:
Substitute
Thus, the moment about origin is
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Chapter 3 Solutions
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