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In this problem we will consider a vapor fluid interface on top of a solid surface. A schematic is shown below:
This is a zoomed-in picture of the edge of a liquid droplet sitting on a surface. The change in the Helmholtz energy due to a change in the position of the vapor-liquid interface along the surface is:
Where are the interaction energies (in N/m, analogous to the intermolecular potential but for macroscopic substances) between the three phases and are material-dependant constants. L is the length of the interface in-and-out of the figure (in-and-out of the page) and θ is the contact angle (a) Compute the work (W) required to move the liquid-vapor interface from x0 to a distance x at constant T, L and θ
(b) Find dU for this system for a given T (for constant T).
(c) You perform an experiment and find that the change in temperature as a function of distance (x) under adiabatic conditions is 10 Kelvin/mm. Find how the contact angle would change as a function of applied heat under isothermal conditions at constant x (and constant L).
The discharge over a triangular notch can be written as Q = (8/15) Cd (2g)0.5 tan(θ/2) H5/2 If an error of 1% in measuring H is introduced determine the corresponding error
In physics, the dielectric material such as Rochelle salt and barium Titan ate with a domain structure containing dipoles (a symmetric distributions of electrical charge) which spo
a rocket is launched at an angle 53 degree to the horizontal with a speed of 100 m/s. it moves along its initial line of motion with an acceleration of 30m/s for 3 seconds. at thi
The ideal gas approximation: The given assumptions are suppose while defining an ideal gas: (i) The number of molecules in the gas is very huge. (ii) The volume V having the
Uses of Radio Isotopes: Industries: 1. Radio active isotopes are used to detect leakage in pipes. 2. It estimates weak and tear machine tools. 3. It is used to check t
An industrial process involves the evaporation of water from a liquid film that forms on a contoured surface. Dry air is passed over the surface, and from laboratory measurements t
Write a short note on different kinds of capacitors. Applying Gauss's law derive the mathematical expression for electric intensity due to a charged conducting spherical shall
Describe an echo. What is the minimum distance needed to form an echo. Write its application.
Q. Define: rms value of AC. RMS value of a.c. The rms value of alternating current is described as that value of the steady current which when passed through a resisto
what is power of lens?
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