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Physique 1Bac Ex 02_12 Travail et puissance - pc-lycee
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Physique 1Bac Ex 02_12 Travail et puissance - pc-lycee
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....ذ. ﻣـﺤـﻤـﺪ ﺻـﺒـﺤـﻲ .ﺛﺎ. ﺧ. ﻃﺎرق. ـﻨـ. ﻔـﻴ. ـ. ﺮة lycee.com. - www.pc. اﻟﺼﻔﺤﺔ. \1. 1. ﻓﻴﺰﻳﺎء. ﺗﻤﺎرﻳﻦ. 02. ﺷـﻐـﻞ وﻗـﺪرة ﻗـﻮة. اﻷوﻟﻰ ﺑﻜﺎﻟﻮرﻳﺎ. اﻟﺘﻤﺮﻳﻦ. 12. ﺑﻮاﺳﻄﺔ ﻣﺤﺮك ﻗﺪرﺗﻪ. 1 kW. ﻧﺪﻳﺮ ﻗﺮﺻﺎ ﻣﺘﺠﺎﻧﺴﺎ ...
ﺷـﻐـﻞ وﻗـﺪرة ﻗـﻮة
ﻓﻴﺰﻳﺎء ﺗﻤﺎرﻳﻦ 02
اﻷوﻟﻰ ﺑﻜﺎﻟﻮرﻳﺎ
اﻟﺘﻤﺮﻳﻦ 12
ﺑﻮاﺳﻄﺔ ﻣﺤﺮك ﻗﺪرﺗﻪ 1 kWﻧﺪﻳﺮ ﻗﺮﺻﺎ ﻣﺘﺠﺎﻧﺴﺎ ﻗﻄﺮه D=10cmﺑﺴﺮﻋﺔ ﺛﺎﺑﺘﺔ ﺗﺴﺎوي 1000 دورة ﻓﻲ اﻟﺪﻗﻴﻘﺔ. -1أﺣﺴﺐ اﻟﺘﺮدد Nﻟﺪوران اﻟﻘﺮص ﺑﻮﺣﺪة .Hzاﺳﺘﻨﺘﺞ ﻗﻴﻤﺔ اﻟﺴﺮﻋﺔ اﻟﺰاوﻳﺔ ﻟﻠﻘﺮص. -2أﺣﺴﺐ اﻟﺴﺮﻋﺔ اﻟﺨﻄﻴﺔ ﻟﻨﻘﻄﺔ ﻣﻦ ﻣﺤﻴﻂ اﻟﻘﺮص. ( 1-3 -3أﺣﺴﺐ اﻟﻌﺰم Mاﻟﺬي ﻧﻌﺘﺒﺮه ﺛﺎﺑﺘﺎ ﻟﻠﻤﺰدوﺟﺔ اﻟﻤﺤﺮﻛﺔ اﻟﺘﻲ ﻳﻄﺒﻘﻬﺎ اﻟﻤﺤﺮك ﻋﻠﻰ اﻟﻘﺮص. ( 2-3أﺣﺴﺐ ﺷﻐﻞ ﻫﺬه اﻟﻤﺰدوﺟﺔ ﻋﻨﺪﻣﺎ ﻳﻨﺠﺰ اﻟﻘﺮص 10دورات. -4ﻧﺮﻳﺪ ﻛﺒﺢ ﺣﺮﻛﺔ اﻟﻘﺮص،وﺑﺎﻟﺘﺎﻟﻲ ﻧﻮﻗﻒ اﻟﻤﺤﺮك ﻋﻦ اﻻﺷﺘﻐﺎل ،ﻟﺬﻟﻚ ﻧﻄﺒﻖ ﻣﻤﺎﺳﻴﺎ ﻋﻠﻰ اﻟﻘﺮص ﻗﻮة Fﻣﻘﺎوﻣﺔ ﺷﺪﺗﻬﺎ . F=25Nﻧﻼﺣﻆ أن اﻟﻘﺮص ﻳﺘﻮﻗﻒ ﻋﻦ اﻟﺤﺮﻛﺔ ﺑﻌﺪ إﻧﺠﺎز 50دورة ﻛﺎﻣﻠﺔ.ﻣﺜﻞ ﻋﻠﻰ ﺷﻜﻞ اﻟﻘﻮة واﺣﺴﺐ اﻟﺸﻐﻞ ) . W ( F
ذ.ﻣـﺤـﻤـﺪ ﺻـﺒـﺤـﻲ
ﺛﺎ.ﻃﺎرق
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