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				<title>AP Physics C A Per. 4 (Palos Verdes High School)</title>
				<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
				<description>
					Class Name: AP Physics C A Per. 4
					Instructor(s):
					
						James Warren
					
					
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				<language>en-us</language>
				<generator>SchoolSitePro</generator>
				
				
					
					<item>
						<title><![CDATA[Due: 01/17/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5325768</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>Nothing accepted for credit after Friday, January 17, 2020</div><br>
								
								
								
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						<pubDate>Thu, 16 Jan 2020 15:48:03 PST</pubDate>
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						<title><![CDATA[Due: 01/17/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5325580</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
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<div>Final Exam Free Response #2 Rubric</div>
<div>&nbsp;</div>
<div>The attched document defends the claim that 13.93 out of 15 points of the Free Response Question 2 on the 2020 final were predictable Gift Points.</div>
<div>&nbsp;</div>
<div>Please note: I haven't graded any student responses yet. I don't know what scores any individuals got. I'm pointing out what points any person could get with little test-time effort. The "any person" here means someone who did their reading and learned the terminology.</div>
<div>&nbsp;</div>
<div>There's no statement here telling a person what they're supposed to earn. The rubric simply says things like "these two particular points were gift points" mainly because I either told people it was coming or some other such thing that only requires eyes be open. I'm not going to say, "You have to take the gifts." However, I do say, "This is how points are awarded in this course. The choice is yours." People who don't know they've had this choice have had their eyes closed to certain things.</div>
<div>&nbsp;</div>
<div>I'll make another such rubric and Gift Point claim for Free Response 3 and post it as soon as I can. The Gift Point count on Free Response 3 will not be as high as 13.93 out of 15. One who reads the rubrics could easily see why.</div>
<div>&nbsp;</div>
<div>FR2 has all but one raw point as freebie, because I told people exactly what they'd be tested on for #2, and I told them months ago, and then I told them again more recently with examples from old tests. People who don't take the gift points but claim they want to are people who make communication errors, not physics errors. I can point out such errors. I can't tell people what to do, so this isn't criticism. It's mere facts. And remember, I state this still without grading student responses from this year yet. So in these statements, I'm being as objective as I possibly can.</div>
<div>&nbsp;</div>
<div>Semester 2 will continue to have gift points that are vocabulary and reading dependent, and more so, because the terminology will relate to electrical quantities which can't be seen with the naked eye, unlike this past semester.</div>
<div>&nbsp;</div>
<div>It's also worth noting that life's too short and difficult to make academic tests be anything but simple. Why would the test writer ever intend to make them complicated? In any instants where after the test a test-taker reports a test item as complex or time-consuming, they are in all cases erroneously characterizing the items as complex or time-consuming in places where they're not. Any person can be aware of the point-scoring game that is inherent to any test, and that's why I point out the gift points.</div>
<div>&nbsp;</div>
<div>Electric field and Electric Potential will be a topic in Semester 2 whose test grades will either be close to 100% per individual or very low per individual with little middle ground, and I never apply any AP scaling to it, because it's not timed. (The scores go into the gradebook as raw score and 85% is an A, 70% is a B, and so on.) This isn't a threat to create motivation. It's a topic whose skills come directly out of reading and practice, and students either do it or don't. It will be inappropriate to claim that the 100%-earners did so because they're smart. That particular test will be entirely full of predictable skills to apply. I tell the class in advance.</div>
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						<pubDate>Tue, 21 Jan 2020 13:16:35 PST</pubDate>
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						<title><![CDATA[Due: 01/17/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5324884</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>Worksheet 12.1</div>
<div>&nbsp;</div>
<div>Let's make it homework, the last assignment of the semester. I've mentioned it a couple times, it's easy and quick, it's interesting, you can race the round items in class, and it's a powerful practice final exam question, so I don't feel bad about saying do that for credit anytime this week.</div>
<div>&nbsp;</div>
<div>The intention of this isn't to bombard with time-consuming things at the last minute. It's to give closure and credit to something that people could have already worked on. And if I'm wrong and there isn't time to do it, then it won't be held against anyone. Looking at it and seeing that it's the quick and easy problem of the unit is an important thing to do. If you don't agree that it's easy, it's really easy to let me know that and set you on the easy track.</div>
<div>&nbsp;</div>
<div>The idea is that the circular cross-section items all end up at the bottom of the hill with an instantaneous speed equal to the square root of (Some number times gH).</div>
<div>&nbsp;</div>
<div>But the "Some number" coefficient is different, depending on whether it's a hoop, sphere, or disk.</div>
<div>&nbsp;</div>
<div>Should be fun and easy. Let me know if it's not. I'd like to make it credit. Anytime by Friday.</div><br>
								
								
								
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						<pubDate>Wed, 15 Jan 2020 15:48:39 PST</pubDate>
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						<title><![CDATA[Due: 01/16/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5324954</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>This is not an assignment or answer sheet or whatever!</div>
<div>&nbsp;</div>
<div>Correcting a typo on a recent document that is NOT urgent. The document is "Cranking Out The Compound Pendulum." The solution notes in the meat of the document were correct and worked with a mass of 1 kg for the ball. The final answer stated in the key is accurate, because it correctly uses 1 kg. But unfortunately, on Page 1, the typo says that the ball's mass was 2 kg. Not a big deal at this point, but I simply wanted to confirm, because someone asked.</div>
<div>&nbsp;</div>
<div>It might be interesting to note that this document has been given to my classes for about 5 years now, with the error in it, and this is the first time a student has pointed out the error, which is glaring when one reads the document.</div>
<div>&nbsp;</div>
<div>The attached version of the document now has the error underlined and the needed correction notes on Page 1. But no one is supposed to work on it. It's bed time.</div><br>
								
								
								
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						<pubDate>Wed, 15 Jan 2020 21:11:34 PST</pubDate>
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						<title><![CDATA[Due: 01/16/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5324939</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>7:09 PM, Wednesday, January 15:</div>
<div>&nbsp;</div>
<div>Stop working and rest soon.</div><br>
								
								
								
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						<pubDate>Wed, 15 Jan 2020 19:10:35 PST</pubDate>
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						<title><![CDATA[Due: 01/16/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5324008</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>
<div>
<div>Compound Ballistic Pendulum - Success!</div>
<div>&nbsp;</div>
<div>I finished the problem based on student-driven data and the ball speed is a good answer. Nice job</div>
<div>&nbsp;</div>
<div>Data Set:</div>
<div>&nbsp;</div>
<div>Turns out you need way more than just two masses.</div>
<div>&nbsp;</div>
<div>Can Mass = 113.3 g</div>
<div>Stick Mass = 321.75 g</div>
<div>Ball Mass = 9.9 g</div>
<div>h = the height the center of the can rose as a result of the collision = 0.783 cm</div>
<div>D = the distance from the suspension hole to the can's center = 1.0 m</div>
<div>d = the distance from the suspension hole to the Can/Stick/ball system's center of mass = 58.9 cm</div>
<div>y = the distance from the midpoint of the stick only to the suspension hole = 42.5 cm</div>
<div>L = the length of the overall stick when no can is attached = 105.2 cm</div>
<div>&nbsp;</div>
<div>No write-up needed. If you can just determine (yes, put the data set first in writing (as always) and then show work on the problem) the ball's can-entry speed, and get it right on the first try, you can earn an experiment assignment A+ grade. Honor system. Each person does their own by themselves. Getting it right on the second try could earn some kind of A as well.</div>
<div>&nbsp;</div>
<div>Note: in getting d above, rather than theoretically derive it, some of us just put the full system on our finger and recorded where it balanced.</div>
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						<pubDate>Wed, 15 Jan 2020 13:46:52 PST</pubDate>
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						<title><![CDATA[Due: 01/16/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5323921</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>Rotation Quiz Key</div>
<div>&nbsp;</div>
<div>This isn't all the way done. I want THREE separate alternative solutions in the file. At the moment, it's only one. I'll add the other two when I get a chance. A person should want efficiency and checking by doing the problem a second way. That's quality control.</div><br>
								
								
								
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						<pubDate>Tue, 14 Jan 2020 15:17:03 PST</pubDate>
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						<title><![CDATA[Due: 01/16/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5323231</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>Answer to a short problem from class:</div>
<div>&nbsp;</div>
<div>If a coffee can is sitting vertically with its open side up and its circular flat bottom against the floor, then how high above the floor is the center of mass of the coffee can? Answer as a fraction of H, the height of the can. The radius of the can's cross-section is (0.4)H.</div>
<div>&nbsp;</div>
<div>Deriving the answer was a strong recommendation on 1/13/2020 between 8 and 8:30 AM. The answer to derive is (5/12)H.</div>
<div>&nbsp;</div>
<div>Consider how this effects the handling of both the moment of inertia and the full system center of mass (counting yellow rod) in the Compound Ballistic Pendulum problem. Everything you see from me treats the can as a particle with the can's own center of mass at its geometric center. You may now numerically evaluate the percent error that is made by my simplifying assumptions.</div><br>
								
								
								
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						<pubDate>Tue, 14 Jan 2020 07:19:30 PST</pubDate>
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						<title><![CDATA[Due: 01/15/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5324002</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>First of two afternoon physics question times is happening in Room 206 right now (Tuesday). The other is tomorrow after school, meaning after 12 Noon.</div>
<div>&nbsp;</div>
<div>The person who asked for the time Wednesday agreed that 1 PM would be good. This is so lunch could be had. I can go either way regarding noon versus 1, but a little break would be nice as opposed to getting right into things at noon. But I can handle it either way. I'll be here at noon. I'll be here at 1. To do questions on problems that people tried.</div><br>
								
								
								
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						<pubDate>Tue, 14 Jan 2020 19:01:53 PST</pubDate>
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						<title><![CDATA[Due: 01/14/2020]]></title>
						<guid isPermaLink="false">//pvhs.pvpusd.net/homeworkItem5323105</guid>
						<link>//pvhs.pvpusd.net/apps/classes/923699/assignments/</link>
						
							<description><![CDATA[
								
									<div>
<div>Omega-90 Data Sheet Update - January 13, 2020</div>
<div>&nbsp;</div>
<div>This is raw class data and refined theoretical calculations for the 6 initially accurate measurers. People from that group of 6 know why there was a refinement. No one else need concern themselves with it. Everyone does need concern themselves with the raw data. These are the values being committed to. If one doesn't speak up, it means one agrees to them.</div>
<div>&nbsp;</div>
<div>18 of 23 student entries are in here. It needs to be 23; the reason it's not is different forms of imprecision, incompletion, or lack of communication of clear data.</div>
<div>&nbsp;</div>
<div>This write-up can be handed in anytime before the final. It's not complicated.</div>
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						<pubDate>Mon, 13 Jan 2020 22:12:07 PST</pubDate>
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