Advertisements
Advertisements
Question
A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer.
Advertisements
Solution
Observation : The balloon will sink.
Explanation : As air is pumped out from jar, the density of air in jar decreases, so the upthrust on balloon decreases. As weight of balloon exceeds the upthrust on it, it sinks.
APPEARS IN
RELATED QUESTIONS
Relative density of a substance is expressed in g cm-3.
Define buoyant force. Name two factors on which buoyant force depends.
A dam has broader walls at the bottom than at the top. Explain.
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
Why is a force needed to keep a block of wood inside water?
Select the correct option.
The unit Nm2 is the unit of
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
Most buoyant objects are those with relatively ______.
- high volume
- higher mass
- low density
- less viscosity
Complete the analogy.
Downward force : Weight :: Upward force offered by liquid : _____.
