Combined moment from the potable water and hydraulic fluid is which value in inch-pounds?

• A. 4023 in-lb
• B. 4003 in-lb
• C. 3990 in-lb
• D. 4040 in-lb

Answer: (B)

Moment is found by summing each item’s contribution about the reference datum. For weight and balance, each item’s contribution is its weight times its arm, and the total combined moment is the sum of those individual moments.

Here, when you add the potable water moment to the hydraulic fluid moment, the total comes out to 4003 in-lb. That value represents the overall effect of both items about the datum, so it’s the correct combined moment.

The other numbers would require different individual moments for one or both items, so they don’t match the actual sum from the setup.