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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).
It is the magnetic flux density which still remains in magnetic materials even when the magnetic force is removed. It is measured or calculated in Weber/m 2 .
A charge of 111 pC is uniformly distributed throughout the volume of an isolated sphere of diameter 40 cm. Calculate the electric field at the following distances from the centre o
Curie law define the magnetic susceptibility of paramagnetic substances is inversely proportional to the absolute heat i.e. Where C = Curie constant, T = absolute temperat
Type 1 and type 2 superconductors: For one group of SUPERCONDUCTOR in which below H c is in the Meissner state, where it excludes all the magnetic flux from the interior of the
types of equilibriam
Figure shows a simple model of spring-mass system. The mass is released from the rest with the springs un-stretched. It's downward acceleration is a=9.81 - 15.24y m/s 2 where y is
A spider is hanging by means of its own silk thread directly above a transparent fixed sphere of r = 20cm .... the refractive index of material of sphere is root(2).... and height
RESISTANCE: An electric current is a flow of free electrons through a conductor. The size of current flowing through a conductor for a given applied voltage depends on: • T
A cooling drum consists of a (horizontally) rotating, large stainless steel cylinder. The cylinder has a diameter D and a width of W. The cooling at the inside of the drum is so ef
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