Recent content by Pete_01

Wait, what do you mean by R_x? The sum of the forces in the x-dir would be A_x+W_x+T_x correct?

I guess I'm still a bit confused. My book shows a pin support (a hinge) with two force components, Ax and Ay.

Would the angle I use for T be 30 degrees?

Homework Statement A door is held open by a cable, which is vertical, and the door is 200kg (its center of gravity is midway along the door). Calculate the tension of the rope and the momentum at the hinge A for angle theta = 30 degrees. Picture here: http://i54.tinypic.com/160wqxk.jpg"...

Awesome! Thanks, I appreciate the help!

Ok, so it would be: melting point water - (-0.4438K) for a final melting point?

Change in temperature (melting temp).

So, like their example at the bottom of the page... and then rearrange and solve for deltaT and I get -0.4438K which doesn't mke much sense?

I'm not following. Use the density to calculate volume change? Or use the Calpeyron equation to calcululate it? The equation I have found so far is: delta(ln p) = delta_vapH/RT^2 * delta T Is this correct? Thanks

Homework Statement The density of solid water is approximately 920 kg m^-3 and that of liquid water is 1000 kg m^-3. Calculate the melting point of ice under a pressure of 6000 kPa. Homework Equations This is my problem. How do I approach this? I don't see any relevant equations in my...

Homework Statement In the temperature range from 60 K to 80 K, a certain amount of liquid has a temperature dependent heat capacity that is given by Cp = 20 J K−1 + T × 0.5 J K−2. Determine the entropy change resulting from heating this sample from 60 K to 80 K. Homework Equations...

Yes, I do. Thanks again!

Ok, perfect thank you. I was wondering if that was how to solve it. So then it would become: (0.85 mol)(8.314 J/Kmol)ln(2.8) = 7.276 J/K Correct?

Homework Statement At a constant temperature, 0.85 mol of an ideal gas changes its pressure from 350 Torr to 125 Torr. Calculate the entropy change for this expansion process. Homework Equations Ideal gas: PV=nRT ΔS = nRln(Vf/Vi) The Attempt at a Solution I'm stuck on how to...