بالعلم ترتقى الامم

بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  4

عربة قطار كتلتها 10 اطنان تسير بسرعة 20 م / ث  اصطدمت بعربة  قطار اخرى ساكنة 

كتلتها 10 اطنان  فاذا تحركت العربتان   بعد التصادم  مباشرة  كجسم واحد 

فاحسب سرعتهما المشتركة حينئذ واحسب ايضا طاقة الحركة المفقودة نتيجة 

للتصادم بالجول

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  3

اذا اثرت قوة مقدارها  40 نيوتن على جسم كتلته 8 كجم لمدة 5 ثوان  فان مقدار 

التغيرؤ فى سرعة الجسم فى نفس اتجاه القوة يساوى ............. م/ ث 

ا- 64

ب- 200

ج- 40

د-25

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  5

ب- جسم كتلته 4 كجم موضوع على مستوى خشن يميل على الافقى بزاوية

قياسها 30 ° ويتصل  بخيط يمر على بكرة ملساء  عند قمة المستوى ويتدلى 

من الطرف الاخر للخيط جسم كتلته  \left(ك\right) كجم  فاذا تحركت الكتلة 4

كجم من السكون  على المستوى  الى اعلى  مسافة  490 سم فى 2 ثانية فاجد 

مقدار  \left(ك\right)  علما بان معامل الاحتكاك الحركى  بين الجسم والمستوى   \frac{\sqrt{3}}{2} 

واوجد ايضا مقدار الضغط على محور البكرة 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  4

ربطت كتلتان 5ك , 2ك كجم فى نهايتى خيط خفيف يمر على بكرة ملساء وتتدليان 

راسيا فاذا تركت المجموعة  تتحرك من سكون فاوجد عجلة حركة المجموعة  

واذا كان الضغط على محور البكرة يساوي 112 نيوتن فاوجد قيمة ك 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  3

اذا اثرت القوتان  \overline{2ق}\ =\ 2\ \overline{س}\ -\ \overline{ص}\ -\ 2\ \overline{ع}   على جسم لفترة زمنية قدرها 2 ث

فان مقدار دفع القوى للجسم = ................. نيوتن / ث

ا-  5\sqrt{2}

ب-10\sqrt{2}

ج-50\sqrt{2}

د-100\sqrt{2}

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  3

ترك جسم كتلته كجم ليهبط من السكون على خط اكبر ميل لمستوى خشن يميل 

على الافقى بزاوية جيبها  \frac{3}{5} .

اذا اصبحت سرعة الجسم 4.9 م / ث بعد  2.5 ث من بدء الحركة فاوجد معامل

الاحتكاك الحركى بين الجسم المستوى 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  5

جسم كتلته ك = \left(2ن\ +\ 5\right)  كجم  ومتجه  موضعه    \overline{ر}\ =\ \left(\frac{1}{2}\ ن2\ +\ ن\ -\ 5\ \right)\ \overline{ى}   حيث  \ \overline{ى}  متجه وحدة ثابت , الازاحة  مقاسة بالمتر  , ن بالثانية اوجد : 

ا- متجهى  السرعة والعجلة عند اى لحظة زمنية ن .

ب- مقدار القوة المؤثرة على الجسم عند ن = 10 ث .

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  5

سيارة وزنها 6 ث طن تصعد منحدرا  يميل على الافقى بزاوية   قياسها 30 متحركة 

فى خط مستقيم , فاذا كانت  المقاومة  لحركة السيارة تساوى 194 نيوتن لكل طن 

من كتلة  السيارة , فان  مقدار  قوة محرك السيارة يساوى ............................ ث كجم 

ا- 4764

ب- 6180

ج- 3294

د-3180

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  4

اذا طلقت رصاصة كتلتها 98 جم افقيا بسرعة 200 م / ث  على حاجز خشبى راسى فاستقرت فيه وكانت مقاومة الخشب للرصاصة ثابتة وتساوى 400 ث كجم فان المسافة التي تغوصها الرصاص داخل الحاجز قبل ان تسكن تساوى ...... سم . 

ا- 100 

ب- 98 

ج- 50 

د- 392 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  11

جسم كتلته 500 جم يسقط من ارتفاع  4.9 متر عن سطح الارض فتكون كمية 

حركته لحظة  وصوله للارض  مساوية ................ كجم م / ث 

ا- 2.45

ب- 4.9

ج- 2450

د- 4900

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