Dimensional analysis is a simple, clear and intuitive method for determining the functional dependence of physical quantities that are of importance to a certain process. However, in physics textbooks, very little space is usually given to this approach and it is often presented only as a diagnostic tool used to determine the validity of dependences otherwise obtained. This paper presents the basics of dimensional analysis in two cases: the resistance force of the fluid that occurs when a body moves through it and the speed of propagation of waves on water. After that, a general approach to dimensional analysis based on the Buckingham theorem is shown. The material presented in the paper could be useful to both students of physics and physics graduates.

nema

In the last twenty years, Serbia has significantly improved the number and quality of accommodation facilities in tourism, especially in the hotel industry. The wellness concept in the hotel offer is known as a highly competitive tourist product, which has the capacity to attract domestic and foreign guests. Hotels in Serbia have recognized this possibility and started investing in wellness facilities and equipment, especially in spas with exceptional natural resources (thermal and mineral water, air and peloid). The COVID-19 pandemic has negatively affected the hotel industry, especially in cities. In response to the challenge, wellness hotels respected the measures of the RS Government and the Crisis headquarters but also changed procedures. Our research has shown that the situation regarding the implementation of anti-Covid standards in Serbia wellness hotels is satisfactory.

Three years ago, one high school class for students with special abilities in physics was founded in Nis, Serbia (www.pmf.ni.ac.yu/f_odeljenje). The basic aim of this project is introducing broadened curriculum of physics, mathematics, computer science, as well as chemistry and biology. Three years after establishing of this specialized class, we present analyses of the pupils' progress in knowledge of physics. These results are compared to the progress results of the pupils in a standard Grammar School and the corresponding classes of the Mathematical Gymnasiums in Nis, Novi Sad and Belgrade. We make some conclusions and remarks, may be useful for the future work that aims to increase pupils' interest in physics.

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