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الاسم : شهد سمير عوامة
الصف : 3 علم 4 
المعلمة : أ . عقيلة سيد عباس</description>
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         <description><![CDATA[<div dir="rtl"><br>هي سرعة تُمثّل جزء من <a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%A9_%D8%A7%D9%84%D8%B6%D9%88%D8%A1">سرعة الضوء</a>، وتُحسب وفقًا لتقدير علمي يضع في الحسبان <a href="https://ar.wikipedia.org/wiki/%D8%A7%D9%84%D9%86%D8%B3%D8%A8%D9%8A%D8%A9_%D8%A7%D9%84%D8%AE%D8%A7%D8%B5%D8%A9">النسبية الخاصة</a>.<a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%B1%D8%B9%D8%A9_%D9%86%D8%B3%D8%A8%D9%8A%D8%A9#cite_note-1"><sup>[1]</sup></a> <a href="https://ar.wikipedia.org/wiki/%D8%AC%D8%B3%D9%8A%D9%85_%D9%86%D8%B3%D8%A8%D9%8A">والجسيم النسبي</a> هو <a href="https://ar.wikipedia.org/wiki/%D8%AC%D8%B3%D9%8A%D9%85_%D8%AF%D9%88%D9%86_%D8%B0%D8%B1%D9%8A">جسيم دون ذري</a> يتحرك بسرعة نسبية.<br><br></div><div dir="rtl"><br>ومن المستحيل تحديد الحد الذي عنده يُصبح الجسيم نسبيًا، ولكن يمكن وصف الجسيم بأنه أصبح نسبيًا عندما تعجز ميكانيكا نيوتن أن تعطي وصف دقيق للسرعة بهامش خطأ أقل من 1%.<br><br></div>]]></description>
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