869. A jack-up 210 feet in length is level during transit. The LCF is 140 feet aft of the bow. How much weight should be applied at the bow to level the jack-up if 150 kips are loaded at the transom?

To maintain levelness, the bow moment must equal the stern moment. The stern load creates a 10,500 kip-ft aft moment (150 kips x 70 ft). Therefore, a 75 kip bow load (75 kips x 140 ft) is required to generate an equal and opposite 10,500 kip-ft forward moment, balancing the trim.