A review of the Khan Academy website.
Watch short videos that cover many subjects, that explain concepts in a great and easy to understand conversational manner.
Over 1800 videos, it is easily the most exhaustive collection of
instruction on the internet
Learners can fill in almost any of their "gaps" from class with
the content on this site
The content is in 10-20 minute videos especially made for
viewing on the computer
Great conversational style of the videos – not what people
expect when receiving maths and science instruction
You can access exercises by logging in – if you have a Gmail or
Facebook account you simply sign in with these when prompted after clicking on“do exercises” at the top of the page. You can watch the relevant video and then
attempt to complete the exercise, and submit your answer online
Classroom use
The videos do not follow a curriculum
The author believes that someone who truly understands the
core concepts will thrive academically regardless of the curricularcontext
Because of the granular nature of the 10 minute videos, the
content can be mapped to almost any state's or nation's standards
Khan Academy videos can be downloaded and saved to a
flashdrive
Teacher and user comments
I think resources like the Khan Academy have a lot more
potential in higher ed than things like lecture capture systems. I’d much ratherhave my students watch a few of these videos before class, then work through
more problems and questions with me during class... I would imagine that many ofmy students would get more out of these videos than they would reading the
textbook. I can’t see these kinds of videos replacing classroom instruction, butfor giving students first exposure to topics and for providing them with
reinforcement after class – yeah, they’ve got lots of potential.
(External Link)
I saw the piece on this wonderful teacher on PBS. Most of us
strive to create an environment where the learner can be exposed to a variety ofexplanations about the phenomena we study. These certainly would be part of that
mix as long as we fully credit the importance of the author's/teacher's work toour students. One day, we will hopefully teach ourselves out of our jobs
(External Link)
I am now in college and learning more than I ever have in my
life. But an inadequate math background has been holding me back. I found theKahn Academy in June of 2009, right after I completed Math 141 ( a college
algebra course). I have spent the entire summer on your youtube page. And I justwanted to thank you for everything you are doing. You are a Godsend. Last week I
tested for a math placement exam and I am now in Honors Math 200. No questionwas answered incorrectly. My placement test holder was so impressed by the
breadth of my knowledge of math that he said I should be in Linear algebra. Mr.Khan, I can say without any doubt that you have changed my life and the lives of
everyone in my family. I wish you and the Khan Academy the best of luck.
(External Link)
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?