EXERCISE

5.A safety line is marked on a boat to 
   ensure that the loads carried by the
   boat do not exceed the limit of its
   capacity.




The total mass of the boat and loads in
the boat is 1740 kg.


(a) Find the maximum buoyant force 
     experienced by the boat.


    -The maximum buoyant force experienced by the 
       boat is 17400 N.


(b) If two men of mass 60 kg and 70 kg 
     intend to travel in this boat,who is 
     more eligible to go in the boat?
     Explain your answer.


    -The men with 60 kg is more eligible because the 
       the men with 60 kg is more mild and light than
       men with 70 kg.Also the boat will not easily to
       sink or wreck when the men with 60 kg is go to
       the boat.




6.The diagram shows a hydrometer.




(a) What is the use of a hydrometer ?


     -The use of hydrometer is to measure the relative
        density of liquids.


(b) What is the purpose of having lead 
      shot at the bottom of the hydrometer?

       -The purpose is to keeps the hydrometer upright.


(c) Explain why the hydrometer is 
     calibrated in such a way that the 
     readings of the scale is increasing 
     downwards. 


     -The volume of liquid displaced decreases when 
        density of liquid increases.The height of hollow
        tube from surface increases.