Online Tutoring HomepageHomepage  Quiz QuestionsQuiz  Homework HelpHomework  ForumForum  Active TopicsActive  SearchSearch  HelpHelp
Malaysian EditionMalaysia  ScoreScore  Create QuizCreate  Invite FriendsInvite  Display List of MembersMembers  About UsAbout
  RegisterRegister  LoginLogin
 Online Tutoring : Forum : Quiz Questions - Physical Sciences : Physics
Topic Topic: Bernoulliís Principle: Buoyant force = Weight of displaced fluid Post ReplyNew Question
Message << Prev Topic | Next Topic >>
Admin Group
Admin Group

Joined: 26†June†2005
Posts: 918
Posted: 20†July†2005 at 11:44am | IP Logged Quote System


was the largest ship in the world when it was launched in 1912. The mass of the ship was 50000 tonnes. When Titanic was seaworthy, calculate the buoyant force that acted upon it, and the volume of seawater displaced by it.

(Use Archimedes' principle. Assume  1 tonne 1000 kg,  gravitational acceleration = 10 m/s  and  seawater density = 1025 kg/m)
    A.   Buoyant Force B = 5107
Seawater volume = 4878 m
    B.   Buoyant Force B = 5108
Seawater volume = 48780 m
    C.   Buoyant Force B = 5109
Seawater volume = 487805 m
    D.   Buoyant Force B = 51010
Seawater volume = 4878049 m
    E.   Buoyant Force B = 51011
Seawater volume = 48780488 m
 QUIZ QUESTION #316 created by Beka on 19 July 2005 at 2:01pm

Correct answer: B    Correct clicks: 36.48%  Wrong clicks: 63.52%
    A.   [28 clicks 17.61%] 
    B.   [58 clicks 36.48%] 
    C.   [22 clicks 13.84%] 
    D.   [32 clicks 20.13%] 
    E.   [19 clicks 11.95%] 
Please discuss this quiz question.
Back to Top View System's Profile Search for other posts by System

Joined: 26†June†2005
Posts: 27
Posted: 23†July†2005 at 7:27pm | IP Logged Quote Beka

From equilibrium of vertical forces, we know that the buoyant force acting on Titanic must equal to its weight, because Titanic is floating. Therefore we first have to calculate the weight of Titanic.

Mass of Titanic (in kg) = 50,000 tonnes  1000 = 5  107kg

Weight of Titanic = 5  107kg    10 m/s = 5  108N

There, we already found the first answer - the magnitude of buoyant force is 5  108N.

To find the second answer, we rely upon Bernoulli's principle which state that the magnitude of the buoyant force must equal the weight of the displaced liquid. We therefore know the weight of the displaced seawater and can equate it as such:

Weight of displaced seawater = 5  108N

(Mass of displaced seawater)  10 m/s = 5  108N

(Volume of displaced seawater)  1025 kg/m  10 m/s = 5  108N

 Volume of displaced seawater =
5  108N
1025 kg/m  10 m/s

Volume of displaced seawater = 48780 m


Back to Top View Beka's Profile Search for other posts by Beka


If you wish to post a reply to this topic you must first login
If you are not already registered you must first register

  Post ReplyNew Question
Printable version Printable version

Forum Jump
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot ask questions in Homework Help

Facilitated by Tuition Plaza Malaysia :: Powered by Web Wiz Forums version 7.9
Copyright ©2001-2017 Web Wiz Guide