The pressure of 1 atm = ______ Pa
Pressure of 1 atm = 1.013 x 105 Pa
Which of the following is not an application of Pascal’s Law?
Pascal's law states that the magnitude of pressure within the fluid is equal in all parts.
Option A: Brahma's press is a Hydraulic Press that works on the principle of Pascal's law.
Option B: Submarines don't work on the principle of Pascal's law.
Option C: Hydraulic lifts works on the principle of pascals law i.e. a force applied on a smaller cylinder is transmitted to lift heavy loads using larger cylinders.
Hence, option B is correct.
In a car lift, compressed air exerts a force F1 on a small piston having a radius of 5cm. This pressure is transmitted to the second piston of a radius of 15cm. If the mass of the car to be lifted is 1350 kg. What is F1?
From Pascal’s law: P1 = P2
⇒ F1/A1 = F2/A2
⇒ F1/πr12 = F2/πr22
⇒ F1 = (F2 * r12 ) / r22 = 1350 * 9.8 * (5 * 10-2)2 / (15 * 10-2)2 = 1470 N = 1.47 * 103 N
What is torr?
The torr is a unit of pressure based on an absolute scale, defined as exactly 1/760 of a standard atmosphere.
It is equivalent to 1 mm of mercury in a barometer and equal to 133.32 pascals.
The formula used to find the pressure on a swimmer h meters below the surface of a lake is: (where Pa is the atmospheric pressure)
We know that the pressure at some point inside the water can be represented by: Pa + ρhg
ρ = Density of the liquid
Pa = Atmospheric pressure
H = Depth at which the body is present
g = Gravitational acceleration
The pressure at the bottom of a tank containing a liquid does not depend on:
Pressure at the bottom of a tank containing liquid is given as P = hρg which is independent of the surface area bottom of the tank.
Find the density when a liquid 5 m high in a column exerts a pressure of 80 Pa.
► Pressure = Density x Gravity x Height = ρgh
⇒ ρ = P/(g*h) = 80 Pa / (9.8 m/s2 x 5 m)
⇒ Density = 1.632 kg/m3
Two vessels with equal base and unequal height have water filled to the same height. The force at the base of the vessels is:
Force at the bases of two vessels will be equal as force depends on height and area. Since it is the same here, force is equal.
Which of the following devices in not based on Pascal’s law?
The pressure measured by a gauge is:
Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure and negative for pressures below it.
Pabs = Pg + Patm
Pg = Pabs - Patm