الرئيسية أسئلة الثالث الثانوي للمراسلة

تمارين و أسئلة و أنشطة في الرياضيات

المعادلات الزمنية

صفيحة معدنية مثلثة الشكل ارتفاعها يساوي نصف طول قاعدتها . تمدد بالحرارة بانتظام محتفظة

بشكلها . فإذا كان معدل زيادة مساحتها 0,05سم2/ث فأوجد معدل التغير في طول قاعدة الصفيحة

عندما يكون طول القاعدة 10سم .

 

سلم طوله 13 قدم يستند أحد طرفيه على حائط رأسي ، وطرفه الآخر على ارض أفقية، فإذا كان

طرفه العلوي ينخفض بمعدل 4قدم/ث ،فأوجد سرعة ابتعاد طرفه السفلي عن الحائط عند ما يكون

طرفه العلوي على ارتفاع 5 قدم من الأرض .

 

انطلق صاروخ راسيا إلى أعلى ، ثم رصد من نقطة تبعد 500م من قاعدة إطلاق الصاروخ فإذا

كانت سرعة الصاروخ 650م/ث عندما يكون على ارتفاع 1200م ، فأوجد معدل التغير في المسافة

بين الصاروخ ونقطة الرصد في تلك اللحظة .

 

طريقان مستقيمان متعامدان وملتقيان في نقطة م ، تسير دراجة على احدهما بسرعة 20كم/الساعة

نحو النقطة م أوجد معدل اقتراب الدراجة من منزل يقع على الطريق الآخر ويبعد عن م مسافة 30

كم ، وذلك عندما تكون الدراجة على بعد 40كم من النقطة م .

 

بدأت نقطة مادية الحركة من نقطة الأصل في المستوى الديكارتي وفي الاتجاه الموجب لمحور

السينات بسرعة 5سم/ث ، إذا كان التدريج المستخدم بالسنتمترات . أوجد معدل تغير بعدها عن

النقطة الثابتة (19،12) بعد ثانيتين من بدء الحركة .

 

رجل طوله 160سم يسير على طريق أفقي بسرعة 1,5م/ث مبتعدا عن مصباح يرتفع عن سطح

الأرض 8م ، أوجد معدل التغير في طول ظل الرجل عندما يكون على بعد 6م من قاعدة المصباح

 

تتحرك نقطة مادية على منحنى الدالة ق(س) = س2 + 1 بحيث يزداد الإحداثي السيني لها بمعدل

2 وحدة /ث ، أوجد معدل تغير البعد بين النقطة المتحركة والنقطة الثابتة (1،0) في اللحظة التي يكون

فيها الإحداثي السيني للنقطة المتحركة يساوي 2 وحدة .

 

قمع على شكل مخروط قاعدته أفقية ورأسه إلى أسفل ، ارتفاعه 60سم ونصف قطر قاعدته 20سم

فإذا كان الماء يصب فيه بمعدل 12سم3/ث ويتسرب بمعدل 3سم3/ث ، فأوجد معدل تغير ارتفاع الماء

في القمع في اللحظة التي يكون ارتفاع الماء 30سم ثم أوجد معدل ازدياد مساحة السطح العلوي للماء

في اللحظة ذاتها .

ملاحظة : هذه الأسئلة منقولة من بنك الأسئلة

جميع الحقوق محفوظة لموقع جزيرة الرياضيات2002 - 2005م

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