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
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
Explain the working of a hydraulic brake with a simple labelled diagram.
In a hydraulic machine, a force of 2 N is applied on the piston of area of cross section 10 cm2. What force is obtained on its piston of area of cross section 100 cm2 ?
What should be the ratio of area of cross section of the master cylinder and wheel cylinder of a hydraulic brake so that a force of 15 N can be obtained at each of its brake shoe by exerting a force of 0.5 N on the pedal ?
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.
The area of cross-sections of the pump plunger and press plunger of a hydraulic press is 0.02 m2 and 8 m2 respectively. If the hydraulic press overcomes a load of 800 kgf, calculate the force acting on the pump plunger.
The atmospheric pressure at a place is 650 mm of Hg. Calculate this pressure in Pascals (Pa).
How does the liquid pressure on a diver change according to the following condition:
When the driver moves to the greater depth?
Name three applications of Pascal's law.
What are the factors on which the pressure of a liquid depends?
State Pascal's law.
State two applications of Pascal's law.
What is the principle of a hydraulic machine?
State and explain Pascal's law of transmission of pressure.
Hydraulic lift works under the principle of _______.
Match the following:
| 1. | Hydraulic press | a. | Archimedes |
| 2. | Cartesian Diver | b. | Floatation |
| 3. | Hydrostatic Balance | c. | Pascal’s law |
| 4. | Hydrometer | d. | Buoyancy |
What are Force multipliers?
A hydraulic press can lift 100 kg when a mass 'm' is placed on the smaller piston. It can lift ______ kg when the diameter of the larger piston is increased by 4 times and that of the smaller piston is decreased by 4 times keeping the same mass 'm' on the smaller piston.
