Advertisements
Advertisements
प्रश्न
Consider the equations `P=lim_(triangles->0)"F"/(triangle"S")` and P1 - P2 = pgz. In an elevator accelerating upward
विकल्प
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
उत्तर
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
संबंधित प्रश्न
Explain the principle of a hydraulic machine. Name two devices which work on this principle.
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 ?
A force of 50 kgf is applied to the smaller piston of a hydraulic machine. Neglecting friction, find the force exerted on the large piston, if the diameters of the pistons are 5 cm and 25 cm respectively.
What force is applied on a piston of area of cross section 2 cm2 to obtain a force 150 N on the piston of area of cross section 12 cm2 in a hydraulic machine?
Select the correct option.
The pressure exerted by 50 kg (g = 10 m/s−2) on an area of cross-section of 2 m2 is
Define the SI unit of pressure.
Name three applications of Pascal's law.
What is the use of altimeter?
Do all liquids exert pressure?
What is the principle of a hydraulic machine?
State two uses of a hydraulic press.
State and explain Pascal's law of transmission of pressure.
Unit of pressure is
Pascal’s law is used in
Hydraulic lift works under the principle of _______.
An iceberg of density 700 kg/m3 is floating in the water of density 1000 kg/m3. The percentage of the volume of ice cube outside the water is:
