Advertisements
Advertisements
Question
When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? (g = 10 m s-2)
Advertisements
Solution
F (force) = ?
m (mass)= 600 kg
a (acceleration due to gravity) = 10 m/s2
F = m × a
= 600 × 10
= 6,000 N
Ans: Buoyant force acting on a boat = 6,000 N.
APPEARS IN
RELATED QUESTIONS
An object of weight 200 N is floating in a liquid. What is the magnitude of buoyant force acting on it ?
A piece of wood floats on water. The buoyant force on wood will be
Define the term thrust. State its S.I. unit.
How does the liquid pressure on a diver change if:
the diver moves to the greater depth
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
(i) The diameter of neck and bottom of a bottle are 2 cm and 10 cm, respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle?
(ii) Name the law/principle you have used to find the force in part (a).
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
A body of mass 3.5 kg displaces 1000 cm3 of water when fully immersed inside it. Calculate:
- the volume of body,
- the upthrust on body and
- the apparent weight of body in water.
Is pressure a vector quantity?
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
