VPython Assignment (0319)

VPython Assignment

The code:

from visual import *
sphere(pos= vector (-3,0,0),radius =1, color=color.blue)
arrow (pos=vector (-3,0,0), axis =vector (3, -3,0), color =color.red)

sphere(pos= vector (3,3,0),radius =1, color=color.blue)
arrow (pos=vector (3,3,0), axis =vector (-3, 0,0), color =color.red)

sphere(pos= vector (3,-3,0),radius =1, color=color.blue)
arrow (pos=vector (3,-3,0), axis =vector (0, 3,0), color =color.red)

2nd Law of Thermodynamics (0310)

2nd Law of Thermodynamics

The three important variables: pressure, volume, and temperature

The graphs describe the relationship between P,V, and T

Here we derived d(PV)/dT (not dQ). The result is dP/dV= A(V)/V, which explains why the graph between Pressure and volume has the downward curve slope

 The band would expand upward (compressed) to compensate the equation F/L= -Y*alpha* delta T

 Here are four steps of how heat engine works. Notice that this is an ideal heat engine, the temperatures of both surroundings and heat engine do not change afterwards.

Here is the plot of 4 points. The area inside is the net work done.

 For the work done between two points, the work done is the area under the curve not inside the curve (or area)

We were calculating the work done by the system.

Experiment to find the the work done of the system.

We learned that that E_int =(3/2) nRT= (3/2) PV. And Stoke's theorem.

First law of thermodynamics(0305)

                    First Law of Thermodynamics

W = Integral(F) dx =integral (P)dV

Water Vapor's Work experiment 

The answer is that the heat release will both change the internal energy (the temperature of water) and push the piston upwards

 what activity produces near zero internal energy (our answer is: walking very slowly) and what activity produces near zero work done (answer is sleeping)

Here is our derivation of how to find the work done. Note that we use linear expansion instead of volume expansion, to offset this error, we simply multiplied the answer by 3 at the end. The final answer is 0.0173 J, which was right.

Derivation to find the root mean square velocity.

Relationship between delta (V)/V and delta (T) /T

Our calculation to find the final temperature inside the syringe.

Ideal Gas Laws (0303）

                                                   First Law of Thermodynamics

The class begin with professor Mason heat the aluminium can for few second and he immediately put into the cold water. However, the aluminium can compresses.

Calculate the atmospheric pressure, we assumed that there are 10000 height of air above with density 1 kg/m^3 ,we used the P=pgh, and the ans is 1*10^5 Pa

Pressure Vs. Volume

Pressure= mT+b with m= 0.2368 kPa/C and b=94.25 kPa.

Linear Curve fit

The lab set up to do pressure and temperature relationship experiment.

The experiment of balloon and  marshmallow.

Use PV=nRT to find out the number of moles

In this class,  we learned about the relationship between Pressure, Volume, Temperature, and number of moles, and we were introduced to Boltzmann's constant in to use with ideal gas law alternatively with gas constant.

Thermal Properties of Matter

Heat the steel ring, suppose the ring size

The set up

Using Logger Pro

Our derivation

Temp Vs. Time

coefficient of liner expansion of Al

The slope of the graph 

Temp Vs. Time Not correct

Assigned Problem (fusion involved)

Practice Problem

Bowling a Manometer

Our Result

Uncertainty