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Tuesday, 8 January 2008
Electric power and Circuits Blog

Answer the questions below.

1.  Which draws more current, a 100 W bulb or a 75 W bulb?  Which has a higher resistance?

 

2.  Why is it dangerous to replace a 15 A fuse that blows repeatedly with a 25 A fuse. 

 

3. Discuss the advantages and disadvantages to connecting Christmas tree lights in a series circuit, and a parallel circuit. 


Posted by georgecelona at 3:15 PM EST
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Monday, 7 January 2008
Ap Fields and Capacitance Blog

 After doing the assigned reading, answer the 2 questions in the space below.

1.  Discuss why the electric field inside any conductor is zero, and why the field outside is always perpendicular to the conductor's surface.  Explain what some applications of this may be.

 

2.  Discuss 3 ways in which the capacitance of a capacitor can be increased; that is, it can store more charge at the same voltage. 


Posted by georgecelona at 9:49 PM EST
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Friday, 4 January 2008
Final Exam Blog
Discuss your opinion of having the exam moved to Friday the 25th here.

Posted by georgecelona at 3:13 PM EST
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Thursday, 3 January 2008
Ap electrostatics blog 2
Discuss in the space below how lightning is really a phenomenon of induction.  Be specific. 

Posted by georgecelona at 3:18 PM EST
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Wednesday, 2 January 2008
AP Electrostatics blog

Please answer the questions below.

 

1.  If you charge a pocekt comb by rubbing it with a silk scarf, how can you determine the sign of its charge?

 

2.  Explain why fog or rain droplets tend to form around ions or electrons in the air.

 

3.  Why does a plastic ruler that has been rubbed with a cloth have the ability to pick up small pieces of paper?  Why is this difficult on a humid day?

 

4.  The form of Coulomb's law is very similar to that for Newton's Universal Law of Gravitation.  What are some similarities and differences between the two?


Posted by georgecelona at 2:53 PM EST
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Honors Electrostatics Blog

Please answer the questions below.  Additionally, if you want to use this space to discuss the demo, please feel free.

 

1.  If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged?

 

2.  Why does a shirt or blouse taken from a clothes dryer sometimes stick to your body?


Posted by georgecelona at 2:49 PM EST
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Thursday, 6 December 2007
Results of Lab
Please discuss your results of the lab on the blog. 

Posted by georgecelona at 3:00 PM EST
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Monday, 3 December 2007
Ap Physics Thin Films Blog

Please answer the question by entering your response below.

 

Why are interference fringes noticible only for a thin film, like a soap bubble, and not for a thick piece of glass?  Explain.


Posted by georgecelona at 3:25 PM EST
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Thursday, 29 November 2007

Please answer both of these questions below.

1)  Suppose a thin piece of glass were placed in front of the lower slit in a double slit experiment so that the two waves enter the slits 180° out of phase. Describe in detail the interference pattern on the screen.

2) Since violet light is deviated through a greater angle than red light when both are incident at the same angle on a prism, is the index of refraction of glass for red light greater than or less than the index of refraction for violet light? Explain using the frequency or wavelength for each color.


Posted by georgecelona at 4:26 PM EST
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Tuesday, 27 November 2007

Please answer the following question:

1) Why, in example 23-15 of the textbook (pg 711), must the converging lens have a shorter focal length than the diverging lens if the latter's focal length is determined by combining them?


Posted by georgecelona at 3:38 PM EST
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Monday, 19 November 2007

To answer the question, see question 15 on pg 716 of your textbook, then respond to the question below.

How would the actual position of the fish differ from the apparent location of the fish in the diagram.  Explain your answer.

 

 


Posted by georgecelona at 2:45 PM EST
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Wednesday, 14 November 2007
Ap Physics choice of topic blog

Hi all,

I need someone from each group to post their group's choice of final project topic, and also to note what people are in your group.  Remember that your choice of topics are:

 

1.  Light as a particle

2.  The Bohr model of the atom

3 .  Nuclear Physics

Note that the group that chose to be a group of 5 will be the Bohr model group.


Posted by georgecelona at 3:36 PM EST
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Tuesday, 30 October 2007
Ap Physics Oscillations Blog

Respond to the blog by posting a message below.

A block-spring system undergoes simple harmonic motion with amplitude A.  Does the total energy change if the mass is doubled by the amplitude remains the same?  Do the potential and kinetic energies depend on the mass?  Explain. 


Posted by georgecelona at 4:52 PM EDT
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Monday, 29 October 2007
AP review Project Blog
Please post your choice of topic from the AP review project by responding to the blog below. 

Posted by georgecelona at 2:27 PM EDT
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Thursday, 25 October 2007
Ap Fluids blog

Respond to the blog by answering the question below.  Then make a comment replying to at least 1 other student's response. 

Consider a boat loaded with scrap iron blocks, floating in a swimming pool.  If the iron in the boat is thrown overboard, will the water level in the pool sink, rise, or remain the same?  Carefully consider Archimede's principle here.


Posted by georgecelona at 3:54 PM EDT
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Friday, 12 October 2007
Momentum Blog 2

Answer the questions by responding to the blog below, then respond to at least one other person's response. 

A "Newton's Cradle" is a popular executive toy consisting of 5 pendula of equal mass and length that are touching when at rest, and so are free to swing back and forth and collide with each other.  When one observes this device, you can see that when 2 balls are dropped from some height on 1 side, 2 balls always come back on the other side, so that momentum is conserved.  However, momentum would also be conserved if when 2 balls made impact, a single ball came out on the other side at twice the speed.  Why then doesn't this happen?

 A bomb, initially at rest, explodes into several pieces.  A) Is the linear momentum of the system conserved?  B)  Is the kinetic energy of the system conserved.


Posted by georgecelona at 2:23 PM EDT
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Wednesday, 10 October 2007
Ap Physics Momentum Blog 1

Answer the question below by responding to the blog.

 

A large bed sheet is held vertically by two students.  A third student takes a raw egg and throws it as hard as he can at the sheet.  Explain why the egg doesn't break when hitting the sheet, regardless of its initial speed.  


Posted by georgecelona at 3:30 PM EDT
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Friday, 5 October 2007
AP Physics Work, Power, and Energy Blog

Answer the questions below by posting a response to the blog .

 

A hill has height h.  A child on a sled (total mass m) slides down starting from rest at the top.  Does the velocity at the bottom depend on the angle of the hill if:

a) it is icy and there is no friction?

 b) there is friction (deep snow)?

 

 

Two identical arrows, one with twice the speed of the other, are fired into an identical target.  Assuming the hay exerts a constant frictional force on the arrows, how much farther will the faster arrow penetrate the target?

 

Why is it easier to climb a mountain via a zigzag trail than climbing straight up? 


Posted by georgecelona at 2:54 PM EDT
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Tuesday, 2 October 2007
AP Physics Work Blog

Please answer each question by posting a comment below.

 

2.  Can a centripetal force ever do work on an object? Explain.

 

3.  Can the normal force on an object ever do work? Explain.

 

25.  Suppose you lift a suitcase from the floor to the table. Does the work you do on the suitcase depend on (a) whether you lift it straight up or along a more complicated path, (b) the time it takes, (c) the height of the table, and (d) the weight of the suitcase? Explain.


Posted by georgecelona at 3:16 PM EDT
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Wednesday, 26 September 2007
Circular Motion Blog

Please answer the question by responding to the prompt below. 

 

On highways, racetracks, and exit ramps, civil engineers design turns that are "banked" (i.e pitched at an angle).  Supposedly, designing the turns in this manner adds to the safety of the roads.  In what way(s) is this possible?  Explain your answer. 


Posted by georgecelona at 12:36 PM EDT
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