530 NICHOLLa S SEAMANSHIP AND NAUTICAL KNOWLEDGE

New KG = °^- = 14-56 feet.
olUU

but KM when loaded= 15-70 „
therefore her QM = 1-14 feet.

Required (1) the transverse BM, (2) the longitudinal BM of a
box-shaped vessel, length 150ft., breadth 30ft, draught 15 ft.

• B2 30x30

150x150

QUESTIONS.
1. What is meant by the moment of a force ?
2. What conditions must be fulfilled to maintain equilibrium
when parallel forces are acting on a body ?
3. Explain what is meant by moment=arm x weight.
4. What is the difference between levers of the first, second and
third class ?
5. Describe and illustrate what is meant by a couple.
6. Describe what is meant by a body being in stable, unstable
and neutral eqxiilibrium. Illustrate your answer in the case of a
cone.
7. Explain what is meant by (i) displacement; (ii) coefficient of
fineness of a ship.
8. Define the terms (i) centre of buoyancy ; (ii) centre of gravity ;
(iii) transverse metacentre; (iv) moment of stability as applied to a
ship.
9. Draw figures and describe exactly the conditions required to
produce stable, unstable and neutral equilibrium in a 'ship.
10. A ship at sea rolls violently, what may this be attributed to 1
11. Explain what is meant by a ship being (i) too stiff; (ii) too
tender ; and what might be done to remedy the conditions ?