Write about 5 things you learned, 3 things you wondered about, and how do you learn more about it. You may or may not watch the movie, but it is recommended that you get information from it
Distinguish between the terms uniform velocity and uniform acceleration.
7-Based on that image, what is the ratio of the wavelength or red light to the wavelength of blue light?
8-A. Describe how you made the measurements using the images on the screen and the scale below them. Estimate the errors in the fringe spacing for each case, and then pair up the separation of the slit and its mirror image d with the spacing of the dark fringes Δx and report them here.
The wavelength of the light responsible for the patterns would be
lambda equals space left parenthesis capital delta x right parenthesis cross times left parenthesis d divided by ell right parenthesis λ = (Δx d / ℓ) as describe on the class website.
Here is the class textbook: https://www.bartol.udel.edu/~owocki/phys633/RadPro…
The assignment questions
1.Consider a point source which is observed both directly and the light from this source is observed from a small cloud. If the source is observed to be unpolarized and the scattering is from Thomson Scattering from free electrons and the geometry is such that the line from the source to the small cloud makes an angle of 45° to the line from the object to the observer. Then what would be the polarization of scattered light from the cloud. Draw a diagram showing the polarizations.
2. An object has a measured emission at 100 MHz of F = 5×10^-17 ergcm ^-2s^-1Hz^-1 at a telescope with a resolution of 9 arc minutes.
3. Consider the ejecta of a supernova, if we approximate this as a sphere of radius, R, of 10 solar mass of fully ionized hydrogen at temperature T=10^6 K, then:
Question 1 (4 points)
a. Make a drawing of the electric field lines around a positive charge, then make a second drawing of the electric field lines around a negative charge. (1 point)
b. What is the mathematical equation for the electric force between two charges? Identify each variable. (1 point)
c. Describe the direction of the electric force between two opposite charges, between two like charges, and when a charge is in an electric field. (1 point)
d. A metal sphere is neutral because it has an equal number of protons and electrons. Draw how the charges in the sphere are redistributed when a negatively charged rod is brought near it. (1 point)
Question 2 (3 points)
a. Describe how electric potential energy, kinetic energy, and work change when two charges of opposite sign are placed near each other. (1 point)
b. Complete the table to show the effect of each change on each electric quantity. (1 point)
| Change | Effect on electric force |
Effect on electric potential energy |
Effect on potential difference |
|---|---|---|---|
| Multiply one charge by 2 |
|||
| Multiply distance by 2 |
c. What is the mathematical equation for capacitance? Identify each variable. (1 point)
Question 3 (4 points)
a. What is the mathematical equation for Ohm’s law? Identify each variable. (1 point)
b. What is the potential difference across a 15 Ω resistor that has a current of 3.0 A? (1 point)
c. Review quantities associated with electric circuits by completing the table. (1 point)
| Symbol | Units (full name and abbreviation) |
|
|---|---|---|
| Potential difference | ||
| Current | ||
| Resistance | ||
| Capacitance | ||
| Charge |
d. Fill in the blanks in the following paragraph to correctly identify the conductive properties of materials. (1 point)
A metal such as copper is a(n) _______________ because it provides a pathway for electric charges to move easily. A material such as rubber is a(n) _______________ because it _______________ the flow of electric charges. A material that partially conducts electric current is a(n) _______________. These materials include _______________ elements.
Question 4 (3 points)
a. Review the properties of meters used in electric circuits by placing an X in the correct column. (1 point)
| Ammeter | Voltmeter | |
|---|---|---|
| Measures current | ||
| Measures potential difference | ||
| Connected in parallel | ||
| Connected in series | ||
| Measurement expressed in amperes | ||
| Measurement expressed in volts | ||
| Measures the amount of charge per second passing through |
||
| Measures the change in energy per unit charge between two points |
b. Write a few sentences comparing three different kinds of circuits: complete, open, and short circuits.
c. Describe how fuses and circuit breakers protect against electrocution and household fires. How do you restore a broken circuit after the problem has been corrected? (1 point)
Question 5 (4 points)
a. Examine the lightbulbs in the circuit below. Write a sentence explaining what would happen if lightbulb A burned out. Repeat this for lightbulbs B, C, and D. (1 point)
b. What is the equivalent resistance if you connect three 10.0 Ω resistors in series? (1 point)
c. What is the equivalent resistance if you connect three 10.0 Ω resistors in parallel? (1 point)
d. Calculate the current in each 10.0 Ω resistor in the series circuit and in the parallel circuit if the power supply is 60.0 V. (1 point)
Question 6 (3 points)
a. What are the ends of a magnet called? Describe the forces that occur when two magnets are brought close together. (1 point)
b. Draw a bar magnet, label its poles, and draw the magnetic field lines around it. (1 point)
c. Explain what happens when you cut a magnet in half. (1 point)
Question 7 (4 points)
a. Compare permanent magnetism, induced magnetism, and electromagnetism. (1 point)
b. Fill in the blanks in the following paragraph to correctly identify the properties of devices that use electromagnetism. (1 point)
A(n) ____________________ changes mechanical energy into ____________________. A(n) ____________________ changes electric energy into ____________________. A(n) ____________________ changes the voltage of an alternating current. A(n) ____________________ transformer has more loops in the primary coil than in the secondary coil. A(n) ____________________ transformer has ____________________ loops in the primary coil than in the secondary coil.
c. Describe how to use right-hand rules to relate the directions of magnetic fields, currents, moving charges, and forces. (1 point)
d. What is the mathematical equation for calculating the force on a charged particle moving through a magnetic field? Identify each variable. (1 point)
Create a presentation to discuss the application of Physics in your major field. This is an individual project. Your topic should be specific about one application with more in-depth research rather than an overview of the applications in general. Since we won’t cover topics like electricity, magnetism, or optics, your topic should be focused on the concepts and principles covered in physics e.g. kinematics, Newton’s Law, Momentum/Impulse, Energy/Work
20 marks
This is a group assignment (2 students per group). Both names should be clearly printed on top of the assignment.
Late assignments will be penalized as follows: up to 24 hours late – 25% deduction; more than 24 late, the assignment will not be accepted.
The assignments must be uploaded into the Assignment folder on eCentennial. Both members of the group must upload the assignment. Please print this document, complete the work in the spaces provided for each question, scan the solutions, and post them under the respective folder.
In this assignment you will consider how to determine the effective capacitance when three different capacitors, labeled A, B, and C, are wired in series and when they are wired in parallel. Next you’ll be asked to predict the capacitance of a network of these capacitors that has both series and parallel elements in it. Finally, you’ll examine a “movie” showing what happens to the effective capacitance when these three capacitors are combined in different ways.
The mysterious Dr. H. does not like surprise guests. He has created a fear emitter, based on sub-sonics, to install atop the keep building at the center of his ancestral compound. His (secret and not IRB-approved) studies at the local laundromat show that the average aversion felt by humans to the fear sound occurs at an intensity of 20 dB and his source will produce 2000 +/- 2% dB.
A uniform rod of length 5m and weight 20N is supported at 1 metre mark and at the 4 metre mark.A painter of weight 750N stands at 3 metre mark.Calculate the reaction at each support.
