Exploration Tools. 3-D Angles Visualizing three-dimensional structures is a major hurdle for chemistry students. Compounding the difficulty, chemists use three different concepts to imply geometry, although there is no obvious geometric information in two of them. The bond angle (a geometric construct) can be known from noting either the hybridization of the central atom (a quantum mechanical construct) or the coordination number (the number of other atoms bonded to the central atom). 3-D Angles uses pattern recognition principles introduced through rapid repeated exposure to three concepts to teach students to intuitively associate the three terms together in order to be able to correctly recognize the molecular structure from limited information.
Current version 3.0 (October 19, 2010) System requirements Windows XP, Windows Vista, or Windows 7 Setup program 3-D_Angles_Setup.exe (2.94 MB) Programmer Stephen Michael Schimpf Crystalline Solids Crystalline Solids attempts to meet that need. GraphLab Worksheets K vs. Alternative Homework Assignment: Tailgating. In this problem we analyze the phenomenon of "tailgating" in a car on a highway at high speeds. This means traveling too close behind the car ahead of you. Tailgating leads to multiple car crashes when one of the cars in a line suddenly slows down. The question we want to answer is: "How close is too close? " To do this, let's suppose you are driving on the highway at a speed of 100 kilometers an hour (a bit more than 60 mph). (a) First let's estimate how long it takes you to respond. Take a piece of paper and have a friend hold the paper from the middle of one of the short sides hanging straight down.
Estimate the time (t2) it takes you to move your foot from the gas pedal to the brake pedal. (b) If you brake hard and fast, you can bring a typical car to rest from 100 kph (about 60 mph) in 5 seconds. (c) Suppose the car ahead of you begins to brake with an acceleration -a0. (d) You see him start to slow immediately (an unreasonable but simplifying assumption). Physics - General Physics I - Homework Help. Can I take a course at HippoCampus for credit? How do I enroll in a course at HippoCampus? Are there any fees to take your courses? How do I make a comment or ask a question? How do I get individual help with my homework assignment?
What are the preferred texts? Do I need to purchase all the texts that are listed? How can I use HippoCampus in my classroom? How can I use HippoCampus in my home school? Can I use the resources you have available for my homeschoolers? Do you know of any wet lab resources to accompany HippoCampus content? Is there a script, app, or something that can be used to track student use of HippoCampus?
Can I share my HippoCampus content with my fellow teachers? Can I download the video? Can I change the size of the video window? Why won't the Environmental Science animations play? What if my page scroll bars or "submit" button are not showing? I can't find closed captioning. Where does the content from your site come from? There is an error in the multimedia presentation.
No. FlexBooks. Physics Video Library :: Home. 400 Years of the Telescope | For Teachers | A Journey of Science, Technology and Thought. This topic can be a little frightening for younger children, and may be better left for the older students. In recent years, astronomers have begun to understand that asteroids (chunks of rock left over from the formation of our solar system) are not just collected in a belt between Mars and Jupiter.
A number of them have orbits that carry them into the neighborhoods of other planets, including Earth. The ones that can come near the Earth are called NEO's (Near Earth Objects) or Earth-crossing Asteroids. Astronomers and geologists have accumulated evidence that many asteroids of various sizes have struck the Earth in the past. More and more evidence is accumulating that a large asteroid (perhaps 5 to 10 miles across) hit the Earth some 65 million years ago, lofting so much hot dust and smoke into the atmosphere that the climate of our entire planet changed.
This is a topic which has inspired many movies and TV dramatizations. Discourse Tools.