This preview shows pages 1–3. Sign up to view the full content.
Chapter 1 Questions
1.
Stability by its definition can be considered:
the tendency for the ship to return to
an upright position.
2.
Center of gravity by its definition can be considered:
the resultant of all vertically
downward forces of gravity
3.
Center of buoyancy by its definition can be considered:
either the centroid of the
displaced volume or the resultant of all vertically upward forces of buoyancy.
4.
Mathematically speaking a couple requires
: two equal forces acting on a body in
opposite directions and along parallel lines.
5.
The couple formed by the center of buoyancy and the center of gravity form what
is known as:
righting moment.
6.
Righting arm is:
a distance
.
7.
Another expression for height of transverse metacenter is:
KM
.
8.
If KG is less than KM the ship would be considered to have: stable equilibrium.
9.
Calculate the moment created by a couple with a force of 5 tons which has an arm
of 2.5 feet.
(Δ * GZ = 5 * 2.5) = 12.5 ft. tons
10. A ship has a quick hard roll.
The ship’s stability is:
large GM.
11. As a vessel inclines to 3° which of the following moves toward the low side?
Assume inclination due to rolling.
B
12. Why can a righting arm be used alone as an indication of transverse stability?
Displacement remains constant at all angels of heel.
13. If a vessel has a displacement of 15,000 tons and a righting arm of 2 feet, what is
the vessel’s righting moment if the ship has a GM of 3 feet?
(15,000 * 2)= 30,000
14. A vessel’s displacement increases but its righting arm does not. What can be said
about the vessel’s righting tendencies?
Increase
15. If a marble is placed on a level table, what type of equilibrium does it possess?
Neutral.
16. Metacentric height method of expressing stability tendency is useful for:
small
angles of inclination.
17. KB plus BM equals what?
Height of metacenter
.
18. KM minus KG equals what?
Metacentric height.
19. KM can be obtained from:
either hydrostatic curves or a table in the ship’s
stability booklet.
20. The product of displacement and GZ is:
either an indication of the vessel’s true
stability or righting moment.
Chapter 2 Questions
1.
Which of the following quantities does the ship’s officer calculate in doing a
transverse stability problem to determine GM?
KG
2.
The point through which all the vertically downward forces of weight are
considered to act is known as:
the center of gravity
3.
The light ship condition is:
a condition prior to loading cargo, fuel, water, and
stores.
4.
A moment it:
neither a weight nor a distance.
5.
A seesaw will not balance. We wish to determine where to put the fulcrum in
order to make it balance. Which of the following methods would you use? You
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document are not allowed to change the distribution of weight.
Revolve moments about one
end of the seesaw only.
6.
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/25/2008 for the course DECK dn220 taught by Professor Lutz during the Spring '08 term at United States Merchant Marine Academy.
 Spring '08
 lutz

Click to edit the document details