Advertisements
Advertisements
Question
Consider the equations `P=lim_(triangles->0)"F"/(triangle"S")` and P1 - P2 = pgz. In an elevator accelerating upward
Options
both the equations are valid
the first is valid but not the second
the second is valid but not the first
both are invalid
Advertisements
Solution
the first is valid but not the second
For a point inside the elevator, pressure can be defined as `P=lim_(triangles->0)"F"/(triangle"S")`. It is independent of the acceleration of the elevator.
The modified form of the second equation, which will be valid in the given case, is given by P1 - P2 = ρ(g+a0)z
Here, acceleration a0 (say) due to elevator accelerating upwards is also taken into account.
APPEARS IN
RELATED QUESTIONS
A piece of wood is floating in water kept in a bottle. The bottle is connected to an air pump. Neglect the compressibility of water. When more air is pushed into the bottle from the pump, the piece of wood will float with
Define one pascal (Pa), the S.I. unit of pressure.
State Pascal's law of transmission of pressure.
Explain the principle of a hydraulic machine. Name two devices which work on this principle.
Draw a simple diagram of a hydraulic jack and explain its working.
The areas of pistons in a hydraulic machine are 5 cm2 and 625 cm2. What force on the smaller piston will support a load of 1250 N on the larger piston? State any assumption which you make in your calculation.
At a given place, a barometer records 70 cm of Hg. If the mercury in the barometer is replaced by water, what would be resulting in reading? (Density of Hg = 13600 kg/m3; Density of water = 1000 kg/m3)
The pressure in the water pipe on the ground floor of a building is 40000 pascals, whereas on the first floor it’s 10000 pascals. Find the height of the first floor. (Acceleration due to gravity g = 10 ms−2)
Define the SI unit of pressure.
How does the liquid pressure on a diver change according to the following condition:
When the driver moves horizontally
What is the use of altimeter?
What are the factors on which the pressure of a liquid depends?
State Pascal's law.
What is the principle of a hydraulic machine?
State the principle on which Brahma press depends.
Pascal’s law is used in
Assertion: Pascal’s law is the working principle of a hydraulic lift.
Reason: Pressure is thrust per unit area.
What are Force multipliers?
