Knowledge is power ,

sharing knowledge is powerful

بوسى
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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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