بالعلم ترتقى الامم

الديناميكا

بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  14

جسم كتلته 60 جم موضو على نصد افقى خشن ثم وصل بخيط خفيف يمر بكرة

صغيرة ملساء عند حافة النضد وحمل فى طرفة جسما  كتلته 38 جم يتدلى  راسيا فاذا تحركت المجموعة

من السكون وقطعت مسافة 70 سم  فى ثانية واحدة . احسب معامل الاحتكاك

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  14

اثرت قوة ق = " 3 ن + 1 " نيوتن على جسم ساكن كتلته 4 كجم مبتدئا

حركته من نقطة الاصل على خط مستقيم فان ع بعد 2 ث = ......

  • 2 سم / ث
  • 2 م / ث
  • 5 م / ث
  • 9 م/ ث

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  22

علق جسم فى ميزان زنبركى مثبت فى سقف مصعد فسجل الميزان القراءة 7

ث كجم عندما كان المصعد ساكنا ثم سجل القراءة 8 ث كجم عندما تحرك

المصعد راسيا بعجلةمنتظمة . اوجد مقدار واتجاه العجلة التى تتحرك بها المصعد

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  14

جسم كتلته الوحدة يتحرك تحت تاثير القوة

ق = " ا + 3 . ب " فاذا كان متجه ازاحته :

ف = ن2 س +    ن2 ص . فان ا + ب = .............

  • صفر
  • 1
  • -1
  • 2

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  15

سيارة قدرة التها ثابتة واقصى سرعة لها عند صعودها منحدر ما هى 54 كم / س

واقصى سرعة لها عند هبوطها نفس المنحدر هى 108 كم / س

اوجد اقصى سرعة تتحرك بها على مستوى افقى علما بان المقاومة لحركة

ثابتة فى الحالات الثلاث

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  23

علق جسم فى ميزان زنبركى مثبت فى سقف مصعد فسجل الميزان القراءة 7 ث كجم عندما كان 

المصعد ساكنا تم سجل القراءة 8 ث كجم  عندما تحرك  المصعد راسيا بعجلة منتظمة  اوجد مقدار

واتجاه العجلة التى يتحرك بها المصعد 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  14

اثرت قوة ق = ( 3 ن + 1 ) نيوتن على جسم ساكن كتلته 4 كجم  مبتدئا حركته من نقطة  الاصل 

على خط مستقيم فان ع بعد 2 ث = .....................................

ا- 2 سم / ث 

ب- 2م / ث 

ج-5م/ث

د-9م/ث

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  15

جسيم يتحرك بسرعة منتظمة  فى خط مستقيم تحت تاثير القوتين  \overline{ق1}\ \ =\ ا\ \overline{س\ }\ -\ 3\overline{ص}\ +\ \overline{ع\ }\ 4\ ,\ 2\overline{ق}\ =\ 6\ \overline{س}\ +\ ب\ \overline{ص}\ -\ جـ\ \overline{ع}   فان ا + ب + جـ = .......................

ا- 1

ب - -1

ج- 2

د- 7

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  17

جسم كتلته 60 جم موضوع على نصد افقى  خشن ثم وصل  بخيط خفيف يمر على بكرة صغيرة ملساء 

عند حافة النضد وحمل فى طرفه جسما كتلته 38 جم يتدلى راسيا  فاذا تحركت المجموعة من السكون 

وقطعت مسافة 70 سم فى ثانية واحدة . احسب معامل الاحتكاك 

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بوسى
منذ 7 سنوات
اجابة  0   مشاهدة  15

اذا  اثرت القوتان   \overline{1ق}\ =\ \overline{س}\ +\ 5\ \overline{ص}\ +\ 7\ \overline{ع}\ ,\ \overline{2ق}\ =\ 2\ \overline{س}\ -\ \overline{ص}\ -\ 7\overline{ع} 

على جسيم لفترة زمنية قدرها  2 ثانية فان مقدار دفع  القوى  بوحدة النيوتن  ث يساوى ........................

ا- 5

ب- 10

ج- 25

د- 106

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