Water cannot be used as a barometric liquid because its density is lower than Mercury. Water's density is 1000 grams per cubic meter. hence it requires a barometer whose height is around 11 meters.
The downstroke of the piston is the condition in which the piston is pushed down when the handle of the water pump is lifted up.
Most hand pumps used to inflate bike tires are reciprocating pumps. They have a piston inside and two one-way valves: one going to the bike tire and one to the outside air. When the pump is pulled up, the pressure inside decreases. This pulls in air from the outside but closes the valve to the bike tire. When the piston is pushed down again, it compresses the air inside. This closes the inlet valve and opens the valve to the tire, pushing air into the bike.
The weight of water displaced by the ship will be more than its own weight i.e., 5*105because it is built in such a way that the weight of the water displaced by the ship is more than its weight itself. So that it will not sink in seawater
The law of floatation states that the "weight of a floating body is equal to the weight of the fluid displaced by the body".
Archimedes principle states that"when a body is partially or wholly immersed in a liquid, it experiences an upthrust which is equal to the weight displaced by it."
Pascal's law states that "when pressure is applied on a liquid enclosed in a vessel, it is transmitted equally in all directions." The two instruments based on Pascal's law are:
When a body is immersed partially or completely in a liquid, the resultant force on the body is called upthrust or buoyant force.
The two factors which affect pressure due to the liquid contained in a vessel are as follows:
P= F/A [definition of pressure]
or, P= m*g/A [since, F= mg]
or, P= d*v*g/A [since, d= m/v or, m= d*v]
or, P= d*A*h*g/A [since, V= A*h]
Therefore, P=d*h*g
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