Navoiy shahar 10-umumiy o’rta ta’lim maktabi 6- “ ” sinf o’quvchisi ning
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3-laboratoriya ishi Mavzu: Qattiq jism zichligini aniqlash Kerakli asboblar. Shayinli tarozi toshlari bilan, o‘lchov chizg‘ichi, to‘g‘ri burchakli parallelepiped shaklidagi yog‘ochdan, plastmassadan, metalldan yasalgan narsalar. To‘g‘ri geometrik shaklga ega bo‘lmagan predmetlar (kichik qaychi, qalamtarosh), suvli menzurka. Ishni bajarish. 1. To‘g‘ri burchakli paralleleped shaklidagi jismlardan biri olinib, uning bo’yi (l1), eni (l2) va balandligi (l3) chizg‘ich yormida o‘lchanadi (22-rasm). Natijalarga ko‘ra V =l1 • l2• l3 hajm hisoblanadi. Tarozining bir pallasiga to‘g‘ri burchakli pallelepiped qo‘yib, ikkinchi pallasiga toshcha solinib muvozanatga keltiriladi. Toshchalarga qarab jism massasi m aniqlanadi. p = m/V formuladan jism zichligi hisoblab xriladi. Yuqorida ko‘rsatilganidek tajriba boshqa parallelepipedlar bilan o‘tkazilib, ularming ham zichliklari aniqlanadi. 0‘lchash va hisoblash natijalari quyidagi jadvalga yoziladi.
To‘g‘ri geometrik shaklga ega bolmagan jismlardan birining massasi m tarozida tortib olinadi. Menzurkaga jism solinganda suv sathi o‘lchov chizig‘idan o‘tib ketmay- digan darajada suv solinadi. Dastlabki suv sathi Vt yozib olinadi. Massasi aniqlangan jismni ipga bog‘lab, menzurkaga tushiriladi. Bunda suv sathi ko‘tariladi (19-rasmga qarang). Suvning jism botirilgandagi sathi V, o‘lchab olinadi. Vjism = V2 — V1 formuladan jism hajmi hisoblanadi. ρjism = mjism/ Vjism dan jism zichligi hisoblab topiladi. Tajriba boshqa jism bilan takrorlanadi va natijalar jadvalga yoziladi.
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