532 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
EXERCISES.
18 In an inclining experiment 100 tons of ballast was shifted from
starboard to port, its centre of gravity moving through a distance of
30 feet and inclining the ship 8°—ship's displacement 9000 tons.
Required the G M. Answer.—2-37 ft.
19. The displacement of a ship was 2600 tons when an inclining
experiment was being conducted. A weight of 3 tons was moved 40
feet transversely from gort to starboard and a plumb line 29 ft. 6 ins.
long was deflected 2 inches. Find the GM. Answer.—8-17 ft.
20 A ship is loaded as follows:—
Cargo—Tons 500 750 620 550 400* 300 200
V.C.G.—Feet 12 14 16 18 20 22 23
Initial displacement of ship 1600 tons and K G 12 feet If K M m
load condition is 17 feet, find the new G M.
Answer.—G MIS feet.
21. A vessel's displacement on arrival in port is 6000 tons, the
V.C.G. being 16 feet. Cargo is to be discharged as follows when K M
will be 13-5 feet. Find what the G M will be after discharging from—
'Tween deck 1500 tons, V.C.G. 21 ft.
Lower holds 2000 „ „ 17 „
1200 „ „ 12 „
Answer.—I'l feet.
+
22. A tanker has 10,000 tons of oil in her main tanks, the C. of G
being 20 feet above the keel; ten summer tanks each of 200 tons
capacity having their C. of G. 30 feet above the keel. The ship's light
displacement is 4500 tons and initial C. of G. 18 feet above keel. If
the K M in load condition is 22 feet, find the new G M.
Answer.—G M 1*3 feet.
23. A ship of 5000 tons displacement has a weight of 200 tons
shifted from 10 feet above her C. of G. to 10 feet below it. Find the
new G M the old G M being — 3 inches.
Answer.—G M 6'6 inches.
24. (i) From the following information calculate the ship's G M.
Displacement 4650 tons in light condition and V.C.G. 22 feet, the
K M after the following loads were put on board being 23-6 feet.
Tons 1500 2500 1700 1950 1700 1000
V.C.G.—Feet 22 24 26 28 18 16
Answer.—G M 10'8 inches.