Recent content by zacc

Hello. Not really. It is a problem that I am solving on my own from an old textbook in Thermodynamics.

Summary:: Gibbs and Helmholtz energies calculations for heating an ideal gas at constant volume I am solving a problem involving an ideal gas that undergoes several chained changes of state. One of the steps asks to calculate the change in Gibbs Energy (DeltaG) and Helmholtz energy (Delta A)...

Hi Simon: Not sure what you mean. First, problem does not state the mass. Second, the equations for kinetic and potential energy both depend on the amplitude which I don't think I can find with the given data. Incidentally, at this point in the curriculum I am not supposed to know about energy...

Homework Statement An object moving with harmonic motion has an acceleration of -2 m/s^2 when the elongation is 0.5 m. Determine the angular frequency and the velocity and acceleration for t=1s. Homework Equations a=-ω2x (1) x=Acos(ωt+θ) (2) a=-Aω2cos(ωt+θ) (3) The Attempt at a...

Tanya and Mark: Indeed I made a mistake and I should have written y=(2/3)*log(t-4). That was my intention. Sorry about that but it was quite late at night when I was writing. Thanks for the correction. Hi Tanya: Thanks for the reply. I still don't see why my original reasoning is flawed...

Hello to all: I was trying to solve the following question: what is the domain of the function y = log [(4-t)^(2/3)] for Real t. Here is my reasoning: The domain of the log(x) is x>0. I would have interpreted this question in terms of the log of the cubic root of (4-t)^2. Thus, I was...

Sorry, for some reason the attachment did not go through the first time. I edited it and it should be there now. Thanks!

Homework Statement The attached figure shows a weightless bar with several forces applied to it (all in New). The distances are as follow: AB=6m, BC=1m and CD=3m. The question is to calculate DE so there is equilibrium. Homework Equations ƩM=0 (Rotational equilibrium)...