Describe how a plane mirror works. Is the image you see real or virtual and why. Does the mirror image appear closer or farther than the actual object. How can you prove that?

1. Assume that in the process of throwing a baseball pitch, the baseball leaves the hand of the pitcher 6 vertical feet above and 60 horizontal feet from home plate. Also assume that your coordinate axes are such that the origin is at ground level directly below the point of release. (a) On the first pitch, the pitcher throws a 140 ft/sec (≈ 95 mph) fastball directly at the center of the strike zone. In the absence of all forces except gravity, how far above the ground is the ball when it crosses home plate and how long does it take the pitch to arrive? (b) A simple model to describe the curve of a baseball assumes the spin of the ball produces a constant sideways acceleration (in our case, the y−direction) of c ft/s2 . Suppose for the second pitch the pitcher throws a curveball with c = 8 ft/s2 . How far does the ball move in the y−direction by the time it reaches home plate, assuming an initial velocity of 117 ft/s? (c) Given that the average strike zone is extends approximately 1.5 feet from the ground up to 3.5 feet above the ground and is approximately 1.5 feet wide (centered over homeplate), were these 2 pitches strikes? (d) In part (b), does the ball curve more in the first half of its trip to the plate or in the second half? Justify your answer. This is everything the question gives.

• Effect of intensity on photoelectrons
  • What effect does changing the light intensity have on the maximum energy of the photoelectrons and what evidence supports your answer?
  • What effect does changing the light intensity have on the charging time and why?
• Effect of frequency on photoelectrons
  • What effect does changing the frequency of the light have on the maximum energy of the photoelectrons and what evidence supports your answer?
  • Are any of the frequencies used below the threshold (work function) of the apparatus and how do you know?

A glass thermometer (m = 13.0 g) is placed into a 110 g cup filled with 220 g of water. These objects have an initial temperature of 28°C. Pieces of ice with a mass of 49 g and starting at -5° is dropped into the cup and water. The equilibrium temperature of the system is 9°C. Find the specific heat of the cup. What is the closest material to this value?

The cutter bars of two combine harvesters from different manufactures develop different failure types with time. Cutter bar A loses the knife sharpening after 10 seasons, while cutter bar B does not lose the knife sharpening but some blades have to be replaced time to time due to local fracture of the edge. Through measuring the volume and the weight the density of both blades are around 7.8 – 7.9 Kg/dm³. The hardness of the blades from A is 2.2 GPa while the hardness of the blades from B is 8 GPa. Discuss two possible manufacturing differences that would lead to this situation. Use suitable references to support your discussion. Suggest two possible technologies to improve the life for bar A. Suggest a way to reduce the brittleness of bar B. Justify your suggestions and compare with real examples if possible.

[Hint] Use heat treatment graphs, composition-mechanical properties, material data, surface engineering…

This is a Lab Report about an experiment.

The experiment should be about HEAT and TEMPERATURE with any example.

Title:

Hypothesis: Statement that the experiment is going to test, prove, or disprove. What is the point of the experiment? (Make a statement that the experiment will either prove or disprove.)

Overview: Brief summary of what occurred in the experiment or what was tested and how.

Uncertainty&Error: Can you trust your data?

Considerations:

1) What factors may have affected or biased the data and introduced uncertainty in the lab measurements? Or, what conditions created uncertainty in your measurements? Which measurements were most affected?”

2) If you were conducting the lab in a physical environment, what other factors would have to be taken into account while accomplishing the procedures? How might they affect the data and/or experiment outcome?

Conclusion/Summary: This section must contain each of the items listed below. You are now the one speaking, of your personal results. Although this is merely an example, it does contain all the requisite components. You may write this section how you see fit, as long as the items annotated are included. However, a checklist or bullet list is not acceptable. The clarity and flow of your conclusion/summary should make clear to any ready what you did in the experiment and how it turned out.

Application: How does this topic—and science in general—impact our understanding of the complex, technological society of which we are a part? How does this explain something in the real world around you?

What is electromagnetic induction and what are its applications?

Electromagnetic wave problem

TE modes=Transverse Electric Modes

TM modes=Transverse Magnetic Modes

problem:

Consider a long straight hollow cylindrical metal tube with an inner diameter R.
Find possible Transverse Electric Modes(TE modes) and Transverse Magnetic Modes(TM modes) that are propagated in this wave guide system

(FIND TE modes and TM modes in this wave guide system)

The potential barrier is defined by V(x) = ((A^2-(x^2)*(b^2))^0.5  where x is less than or equal to A/b.

First we want to sketch V(x)

Then we run a particle into it wth mass m and energy E (which is less than A). Now that we have run the particle into it we are asked to derive an expression for the probability of penetration in terms of D = E/A and sin (y) = bx/A.

Finally, we are to evaluate our expression in numerically for D=0.1 to 1.0 in steps of 0.1 for an electron stricking such a barrier with A=10 eV and b=2eV/angstrom.

Help!! I have no idea how to start this monster. How do I sketch this??

Consider a long straight hollow cylindrical metal tube with an inner diameter of R. The possible TE modes and TM modes for electromagnetic waves to propagate in this wave guide system