For additional help, you can check online solvers like Obozrevatel Gdz which covers specific paragraph solutions .
Л.Э. Генденштейн, Л. А. Кирик, И. М. Гельфгат - ФИЗИКА fizika 7 klass gendenshtejn 18.15 reshenie
Always convert cm to m (divide by 100) and kPa to Pa (multiply by 1000) before calculating . For additional help, you can check online solvers