Advertisements
Advertisements
Question
State the laws of flotation.
Advertisements
Solution
Laws of flotation are,
- The weight of a floating body in a fluid is equal to the weight of the fluid displaced by the body.
- The centre of gravity of the floating body and the centre of buoyancy are in the same vertical line.
APPEARS IN
RELATED QUESTIONS
A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reasons. (b) What will be the apparent weight of the ball?
Explain the following :
Icebergs floating in sea are dangerous for ships.
A weather forecasting plastic balloon of volume 15 m3 contains hydrogen of density 0.09 kg m-3. The volume of equipment carried by the balloon is negligible compared to its own volume. The mass of an empty balloon alone is 7.15 kg. The balloon is floating in air of density of 1.3 kg m-3. Calculate:
(i) The mass of hydrogen in the balloon,
(ii) The mass of hydrogen and balloon,
(iii) The total mass of hydrogen, balloon and equipment if the mass of equipment is x kg,
(iv) The mass of air displaced by balloon and
(v) The mass of equipment using the law of floatation.
A hollow metal cylinder of length 10 cm floats in alcohol of density 0.80 g cm-3, with 1 cm of its length above it. What length of cylinder will be above copper sulphate solution of density 1.25 g cm-3?
What fraction of metal of density 3400 kgm-3 will be above the surface of mercury of density 13600 kgm-3, while floating in mercury?
A cube of ice whose side is 4.0 cm is allowed to melt. The volume of water formed is found to be 58.24 cm3. Find the density of ice.
Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
Explain the following:
Icebergs floating in the sea are very dangerous for ships.
Assertion: To float, body must displace liquid whose weight is equal to the actual weight.
Reason: The body will experience no net downward force in that case.
Differentiate positive & negative buoyant.
