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Correspondence Physics Competition

 

Correspondence competitions in solving problems, designated for students of grammar schools, have
a long tradition in Slovakia. The first one (mathematical) started in 1976 in Košice. It was probably the first competition of this kind in the world!

The Correspondence Physics Competition (CPC) was created in 1983 in Bratislava. Since that time CPC was held 18 times, every year about 200 students from all Slovakia participate in the CPC. During the existence of the competition, the best participants attended more than 40 physics camps at various places in Slovakia.

The CPC was founded by the lecturers of the Faculty of Mathematics, Physics and Informatics at Comenius University in Bratislava. At present, the students of this faculty do all the organizational work.

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.

 

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.

 


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?

Hollywood Tricks

A shot from an action film: The hero with a weight of 80 kg is tied to the rope with rigidity 40 N/m. He jumps from a bridge that is 100 meters high.

The shot is to be made with a puppet of the hero and the bridge will be only two meters high. What must the rope rigidity, the weight of the puppet and the slow down of the filming be in order to make the jump look real in the movie?

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?

 

 

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