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A51c5217 c0c6 4d69 a766 9d00f2c41266

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H1 و HAC1:15.1 -CH0 اختبار في مادة: علوم فيزيائية / الشعبة: ریاضیات، تقني رياضي / بكالوريا 2018 الموضوع الثاني يحتوي الموضوع الثاني على (05) صفحات (من الصفحة 6 من 10 إلى الصفحة 10 من 10) الجزء الأول: (14 نقطة) التمرين الأول: (04 نقاط) بالون مطاطي كروي الشكل مملوء بالهواء ، كتلته m = 20g ومركز عطالته . يترك ليسقط في الهواء دون مسرعة ابتدائية عند اللحظة0 = 1 وفق محور شاقولي (0) موجه نحو الأسفل ، مبدؤه يوافق مبدأ الأزمنة 0= . تمكنا عن طريق التصوير المتعاقب من رسم منحني تغيرات السرعة (4)« لمركز عطالة البالون بدلالة الزمن ، كما في الشكل -1-. تعتبر أن البالون يخضع أثناء حركته لقوة احتكاك kw-= حيث k ثابت بمثل معامل الاحتكاك. 1. مثل القوى المؤثرة على البالون في الحالتين: ) لحظة الانطلاق التي توافق 0=t. ب) خلال الحركة. 2. بتطبيق القانون الثاني لنيوتن على مركز عطالة البالون G في معلم عطالي: )) بين أن المعادلة التفاضلية للسرعة تكتب على الشكل : " (ms) ...
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