Lab background:

I set up two styrofoam cups attached together by an aluminum transfer bar (a conductor). One cup contained 200g of boiling water, while the other cup contained only 100g of ice water. Every two minutes, I took the temperature of both the cups. There were two slits on the top of the enclosed styrofoam cups to allow a thermometer to take the temperature of both of the contents in the two cups. It seems as though, the hot water LOST heat nearly twice as fast as the cold water gained heat.

Question 1: Why did this happen??? Does it have to do with the different volumes/ surface area?

Question 2: I later calculated the heat lost by the hot water and the heat gained by the cold water (which, technically, should be the same consiering the laws of thermodynamics). Heat lost= 27720 J and heat gained= 11340 J. So they are clearly not the same ... what 2 reasons could cause the difference???

Questions 3: How do I estimate at which both containers should stabilize???

thanks

A straight, nonconducting plastic wire 7.00 cmlong carries a charge density of 100 nC/mdistributed uniformly along its length. It is lying on a horizontal tabletop.

Find the magnitude and direction of the electric field this wire produces at a point 4.00 cm directly above its midpoint.

If the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 4.00 cm directly above its center.

1.) The Hubble Space Telescope orbits the Earth at an approximate altitude of 612 km. Its mass is 11,100 kg and the mass of the Earth is 5.97×1024 kg. The Earth's average radius is 6.38×106 m. What is the magnitude of the gravitational force that the Earth exerts on the Hubble? (Answer in N)

An infinitely long line of charge has a linear charge density of 5.00×10⁻¹² C/m . A proton is at distance 16.0 cm from the line and is moving directly toward the line with speed 1000 m/s .

How close does the proton get to the line of charge?

In Fig, take E0 = 12 V, R1 = 4.0 W, R2 = 8.0 W, R3 = 2.0 W, and L = 2.0 H. What is the current I2 (a) immediately after the switch is first closed and (b) a long time after the switch is closed? (c) After a long time the switch is again opened. Now what is I2?

The Problem with the picture is on Problem 36 in the website below

https://www-physics.ucsd.edu/students/courses/winter2010/physics2b/hw/hw9.pdf

A 73.0 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 39.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities (in m/s) be in this case? (Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer.)

Puck: ____

Goalie: ____

A mass is attached to a string on a pulley, when the mass is falling what direction is the pulley spinning? Which direction do the vectors for torque, angular acceleration, and angular velocity point? What about when the mass is going back up? Please draw a diagram showing these vectors.

Calculate the Q value for each of the following reactions. You may need to look up some of the atomic masses on the web. You can find a good one by typing in ``atomic mass nist'' into Google. Express your answer in MeV.

1. 40Ca -> e+ + 40K + neutrino
2. 98Ru -> 4He + 94Mo
3. 144Nd -> 4He + 140Ce

A 62.5 kg skier is moving at 6.15 m/s on a frictionless, horizontal snow-covered plateau when she encounters a rough patch 4.00 m long. The coefficient of kinetic friction between this patch and her skis is 0.320. After crossing the rough patch and returning to friction-free snow, she skis down an icy, frictionless hill 3.35 m high.

A)How fast is the skier moving when she gets to the bottom of the hill?

BHow much internal energy was generated in crossing the rough patch?

Use Gauss's law to prove that the electric field outside any spherically symmetric charge distribution is the same as if all of the charge were concentrated into a point charge at the center of the sphere. Then use Gauss's law to prove that the electric field inside a spherically symmetric conductor carrying a net charge on its surface is zero.

Ok the question asks

Know the definitions for the following terms(writing the equation/formula only is not enough):

Magnetic Flux

Faraday's Law

Lenz's Law

It asks for all 3 and again just writing equation/formula is not enough.

1.List two to three things you wonder about that might be answered in this class. Examples: How does a water wave become a Tsunami? Why do I get “bounced” when my car goes over a big bump?

2. Identify a real world oscillating object. Include a photograph or sketch of the object.

Derive the equations of the electron and hole concentrations in terms of the impurity doping concentrations, using the concepts of complete ionization and charge neutrality.

A red car and a blue car are driving in the same direction on the interstate. The red car is travelling at 25 m/s, while the blue car is travelling at 35 m/s. The driver of the blue car is not paying attention and rear-ends the red car. The red car has a mass of 2,000 kg while the blue car is only 1,000 kg.

A Prior to the collision, what is the value of the center of mass kinetic energy?

B. In order for this collision to be isolated, what is the maximum amount of energy that can be converted to other forms during the collision? What percentage of the initial kinetic energy does this represent?

C. If the system loses 40% of its kinetic energy in the collision, is the system isolated? Why or why not?

D. Prior to the collision, how fast and in what direction would you need to be travelling in order for the system to appear to have zero momentum?

E. Regardless of your answer to part (c), assume now that the two vehicles form an isolated system. If they cars stick together, how fast will they be moving?

F. What minimum amount of kinetic energy must be conserved in order to conserve the momentum of the system?

Using a 685 nm wavelength laser, you form the diffraction pattern of a 0.119 mm wide slit on a screen. You measure on the screen that the 11th dark fringe is 9.47 cm away from the center of the central maximum. How far is the screen located from the slit?