بالعلم ترتقى الامم

الديناميكا

بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  4

اذا كانت قدرة الة عند اى زمن ن مقاسا بالثانية تساوى  \left(9ن2\ +\ \ 4\ ن\right) وحدة

قدرة فان الشغل المبذول من الالة خلال الثانية الرابعة يساوى ......... وحدة شغل 

ا- 125

ب- 67

ج- 224

د- 99

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  3

اذا تحرك جسم كتلته 200 جم بسرعة  \overline{ع} = 60 \overline{س} - \overline{ص}80  حيث \overline{س\ }\ ,\ \overline{ص}  

متجها وحدة متعامدان ومقدار السرعة مقيس بوحدة سم / ث فان طاقة حركة 

هذا الجسم تساوى .................................. ا ر ج 

ا- 104

ب- 2 × 104

ج-106

د- 2 × 106

بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  11

اذا اثرت قوة متغير ق مقاسة بالدان على جسم حيث  

ق =4 ف -2ف +ا فان الشغل المبذول من هذه القوة فى الفترة من 

ف = صفرسم الى ف = 4 سم يساوى ............ ارج . 

ا - 256 

ب - 244 

ج - 16 

د - 4 

 

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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