636 NICHOLLS'S SEAMANSHIP ANrD NAUTICAL KNOWLEDGE
38. Vessel 210 ft. long is drawing 10 ft. on even kcol in salt water.
A weight of 25 tons is moved horizontally towards the stern 30 ft. Find
the new draughts, assuming the centre of flotation to be amidships
and the I T.M.=250 foot-tons.
Answer —Forward 9 ft. 10| ins. Aft 10 ft. 1| ins.
30.—Ship 300 ft. long, draught 21 ft. forward and 22 ft. aft. The
I.T.M.=480 foot-tons and a weight of 40 tons is moved 50 ft. aft. Find
the new draughts. >
Answer.—Forward 20 ft. 9-9 ins. Aft 22 ft. 2-1 ins.
40. Find the total pressure on a keel plate 20 ft. X 3 ft. at 10 ft. draught
on an even keel in salt water.
Answer.—38,400 Ibs.
41. A vessel's light displacement is ] 800 tons K.G.=10 ft. She loads
3400 tons of cargo, K.G.=9 ft., and 400 tons bunkers, K.G. 16 ft. Find
the new K.G.
Answer.--9-82 ft.
42. Ship of 1600 tons displacement has C.B. 8 ft. above keel, K.G.
10 ft and K.M, 11-5 ft. Find the angle of heel if a weight of 8 tons were
moved 20 ft. transversely
Answer.—3° 49'.
43. A box-shaped vessel 200 ft. X40 ft. X18 ft. floats at a draught of
10 ft. Find K.M.
Answer.—K.M. 18-33 ft.
44. A vessel of 5000 tons displacement with K.G. 15»8 ft- has her
transverse rnetacentre 18 ft. above the keeL Find her righting moment
when she is heeled 7°.
Answer.—Righting moment of 1340 foot-tons.
* *
45. A ship of 3330 tons displacement draws 17 ft. 0 ins. forward and
16 ft. 6 ins. aft. Her T.P.I, is 21 and her I.T.M. 275 foot^tons. Her
No. 5 tank of capacity 78 tons is run up. Find her new draught if
CG of the ballast is 50 ft. abaft the tipping centre, which is assumed to
be amidships.
Answer.—Forward 16 ft. 8-6 ins. Aft 17 ft. 4-8 ins.
46. Required (1) the transverse B.M.; (2) the longitudinal B.M.;