Follow this link and vote for your favorite Free-fall & Projectiles presentation.
Tuesday, December 18, 2007
Inertia Results
In the first place is Presentation 2 with 46.4 % of the vote.In the second place is Presentation 5 with 30.8 % of the vote.
and
In the third place is Presentation 3 with 15.4 % of the vote.
Thursday, December 13, 2007
Mass vs. Weight Survey Resutls
The results are in!
In the first place is Presentation 5 with 36.8 % of the vote.
Second place was won by Presentation 3 with 28.9 % of the vote.
Presentation 2 came in 3rd with 21.1 % of the vote.
There is still time to vote for the Inertia & First Law of Motion presentations.
In the first place is Presentation 5 with 36.8 % of the vote.
Second place was won by Presentation 3 with 28.9 % of the vote.
Presentation 2 came in 3rd with 21.1 % of the vote.
There is still time to vote for the Inertia & First Law of Motion presentations.
Wednesday, December 12, 2007
Tuesday, December 11, 2007
Vectors vs. Scalars results
And the winner is …[insert drum roll here] … 
Presentation 5 (with 36% of the vote)
Second place was won by Presentation 2 (24 % of the vote) and Presentation 1 came in third (22.9%).
Congratulations all winners!
Voting for Mass vs. Weight presentations will be opened till mid-night on Wed. Dec. 12. Please rate Mass vs. Weight presentations here.
Presentation 5 (with 36% of the vote)
Second place was won by Presentation 2 (24 % of the vote) and Presentation 1 came in third (22.9%).
Congratulations all winners!
Voting for Mass vs. Weight presentations will be opened till mid-night on Wed. Dec. 12. Please rate Mass vs. Weight presentations here.
Sunday, December 9, 2007
More on deflecting asteroids
Copied from an article in the New York Times.
By LIA MILLER
Published: December 9, 2007
Published: December 9, 2007
In 1908, an asteroid is thought to have entered the earth’s atmosphere and exploded over a Siberian forest, leveling some 800 square miles of trees in what is known as the Tunguska Event. If we knew today that another asteroid were on a path to intersect with our planet, what could we do?
Massimiliano Vasile, a lecturer in aerospace engineering at the University of Glasgow, recently concluded a two-year study comparing nine asteroid-deflection methods, rating them for efficiency, complexity and launch readiness.
The best method, called “mirror bees,” entails sending a group of small satellites equipped with mirrors 30 to 100 feet wide into space to “swarm” around an asteroid and trail it, Vasile explains. The mirrors would be tilted to reflect sunlight onto the asteroid, vaporizing one spot and releasing a stream of gases that would slowly move it off course. Vasile says this method is especially appealing because it could be scaled easily: 25 to 5,000 satellites could be used, depending on the size of the rock.
The losing ideas — satellites equipped with lasers; detonating a nuclear explosion; pushing the asteroid with a spacecraft, to name a few — might still have their place. Vasile says improved technologies could make others appealing in the future. (In March, NASA released a report on “near Earth objects” that deemed the nuclear-explosion method the most effective.)
Michael Gaffey, professor of space studies at the University of North Dakota, says the risk of dying from an asteroid strike is about 1 in 2 million. The problem is that the consequences are tremendous; a half-mile-wide asteroid or larger, of which there are more than 700 that come close to Earth’s orbit, could have an impact equal to 60 billion tons of TNT. While it is not likely to happen, you still want to be prepared. “You don’t panic, you don’t have to run around screaming and waving your hands,” Gaffey says. “But you do need to devote resources to it.
Physics Media Files ...
The first of the media files have been posted.
Enjoy!
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Voting link for these will be posted once all of the files are uploaded.
Enjoy!
You might want to consider subscribing to the podcast -- this way you will not need to go to the site to upload upcoming files.
Voting link for these will be posted once all of the files are uploaded.
Saturday, December 8, 2007
Friday, December 7, 2007
Project 1: Vectors vs Scalars
Please review the Vectors vs. Scalars presentations posted below. Consider the following questions:
1. Which of these presentations did you find most useful?
2. What about that presentation made it useful?
3. How can it be improved?
Please do NOT post your comments here. Post them under the presentation(s) on which you wish to comment.
Please rate presentations now.
1. Which of these presentations did you find most useful?
2. What about that presentation made it useful?
3. How can it be improved?
Please do NOT post your comments here. Post them under the presentation(s) on which you wish to comment.
Please rate presentations now.
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