week 5 day 2

There were not many pictures this day, a lot of people were sick that day, so was our professor. 

we looked at greek letter landa which represents the linear object. We integrated to get E=kQ/d(L+d)

When a point particle went through two rod with charges.

Then we looked into torque.

Lastly, we considered the electric field of objects.

week 5 day 1

We looked at electric field this time. It follows E=F/q. Then we substute F=kq1q2/r^2/q to get E=kq/R^2.

In real situation, charges are in three dimension. We graphed it.

We also did it in vpython.

We then calculated some electric field due to two point charges.

We calculated the electric field.

We did it in an excel spreadsheet to calculate the electric field due to a charged rod.

Week3 day 1

We looked into some depth of the equation PV=nRT

We broke down the relationship among PVT in different conditions.

We matched each condition with a graph.

This was the four steps we came up for an engine.

We calculate the U, Q, and W for a complete cycle.

This was another problem we did for a complete cycle.

week 4 day 2

We started electric forces.

We did some tape experiment. Maybe it was a wet day, it didn't go well.

But at least, the tapes attract each other.

Then we looked at a metal ball repel another metal ball that hangs under a string. We calculated the force on the repeled ball in terms of mass, displacement and length of the string.

We inserted points and got this graph of the force/seperation distance.

We then looked into electrical force between two point particles that have charge.

Then we calculated electrical force in two dimension.

this is a electric generator. charge went to the paper strips. when they have same charge, they repel each other.

Then we did calculation of electric force based on the formula Fe=Kq1q2/r^2

comparing to gravitation formula Fg=Gm1m2/r^2

Then we noticed gravitation force is very small.

Week 4 day 1

Today, we looked at work output through temperature.

COP is coefficent of performance.

For heating, COP=Qh/W

For cooling, COP=Qc/W

As maximum, COP=Th/(Th-Tc)

Efficiency=W/Qh

Then we did this problem.

This is the solution.

Week 3 day 2

Today, we are still on thermodynamics.

In the picture above, it's a device that transfer thermal energy into electrical energy. When the two side metal touches two reservoir that has a difference in temperature, the middle plate will spin.

Through this device, we can measure the eletricity generated through this device by the difference in temperature.

Then we got into some heat capacity. Cp=Cv+R. while this is hold true, Cv changes based on the type of gas. For monotomic gases, Cv=3/2R. For diatomic gases, Cv=5/2R. while R is a constant that equals 8.314.

These two pictures are from Work formula for adiabatic process meaning heat is held constant.

then we did this cycle. we could calculate the work and change in internal energy, then we can calculate heat.

This is otto cycle model.

Week 2 Day 2

Today we did some labs that the pressure is constant while the temperature and volume changes.

The piston is free to move. thus the pressure inside is equal to surrounding pressure. Then, as we put the flask into hot water, the volume will increase.

We can use w=p*\delta V for constant pressure. We did this thermal expansion problem from the picture above.

We also consider the kinetic energy of molecules inside the container. The final formula was shown in the picture above.

Base on the formula before, we can calculate the relationship between percent change in T and V.

Lastly, we did a problem that uses the formula we got today as above.