I’ve been looking through the results of the traffic light survey we did at the end of unit 1 of the higher course. The learning outcome that most people were unhappy about was the derivation of the equations of motion.
I put together a handout that outlines where the 3 equations come from, starting with a simple velocity-time graph. Let me know if you think your understanding of this outcome would benefit from the video treatment I have used in your homework solutions.
For those of you preparing for S Grade prelims straight after the Christmas holidays, I have added a 6 page summary on radioactivity & half-life calculations with worked examples and extra questions (with answers) for you to try.
You’ll find the pdf file containing all this radioactive goodness in the Health Physics section of the Standard Grade revision page.
The video provides the solution to Q7.
The solution to Q6 is contained in the video.
One Volt is the potential difference that exists between two points if 1 Joule of work is required to move 1C of charge between the points.
The solution to Q3(a) is contained in the attached video file. Solutions to the other parts of Q3 are: Q3(b) The gas is at constant temperature. Q3(c) The volume of the oxygen tank will always have some gas in it, so not all of the 75 litres of air are available for the astronaut to breathe.
Here is the solution to HW Q2 due on 15/12/08.
Solution to Q1 from HW due on 15/12/08. This video contains the solution to Q1(a). The solution to Q1(b) is: As temperature increases, the average kinetic energy of the gas molecules increases. This means that the molecules travel more quickly and hit the walls of the tyre harder and more often – causing an increase in pressure.
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