Correspondence
competitions in solving problems, designated for students of grammar schools,
have
a long tradition in
The
Correspondence Physics Competition (CPC) was created in 1983 in
The
CPC was founded by the lecturers of the Faculty of Mathematics, Physics and
Informatics at
Problems
solved in the CPC are not standard book-style problems. Our aim is to lead the
participants to experiments and to approach common phenomena through physics.
In order to achieve this goal we are not proposing only problems like “You know
X and Y, find Z!”, but also problems like “Explain!”
and “Try out!”. Since we try not to repeat problems, making up new series of
problems is quite challenging. Sometimes we use older literature to find new
problems, but we are also making up our new original problems – some of them
are listed on the second page.
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our web-page: www.fks.sk |
Preparing
the competition is not our only activity. We organize a weeklong stay for the
best participants in the CPC twice a year. Each camp brings together 30
talented young physicists. The basic
element of the daily program there is physics in various forms, i.e. lectures,
games, experiments and discussions… The rest of the day consists of several
games and sport activities, which help to build a good atmosphere in the camp.
Our participants enjoy these stays very much. The possibility of coming there
is an important motivation for further problem solving – and helps to develop
students’ deeper interest in physics.
Some
contest problems
Here
are some original problems, which were proposed in the CPC.
We hope that you find them interesting and helpful.
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Find the North! It is
possible to find North with the help of a watch. How? Prove this
experimentally. How big is the deviation between your solution and the
correct direction? Can you justify it with calculation? |
World Record
Two air-conditioned athletic fields were built on the equator and on the north pole. World championships were held in the polar one. The winner of shot-put threw 23 meters and created a new world record. Could he make it on the equator? How long would be the throw there? Suppose that the athletes perform the same physical power in both places. |
Remote Control
Measure the coefficient of absorption k of a letter paper for infrared beams of a TV remote control. (Your task is to find out the ratio of rays absorbed when passing through one sheet of paper.) |
On the Road If you are traveling by car and watching the road in front of you with binoculars, you can notice that the road is moving slower than expected. Express how much slower this looks depending on parameters of your binoculars. |
Save Fuel
Try to estimate the minimal gasoline consumption of a usual family car. Assume that it is moving uniformly with a speed of 80 km per hour in summer and on a flat straight highway. What about city-ride? Why is there a bigger consumption of gasoline? |
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Shower
Hot water flows vertically upwards from shower. Its temperature is T1. The height of the stream is H. If we add cold water with the temperature T2, the stream height changes to 2H. What is the water temperature now? |
Color of the Moon
If you look at the Moon at night, it seems to be yellow. If you look at it during the day, it seems to be white. Why is it so? |