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انجمن علمی نجوم و فیزیك - جواب مساله هفتم

جواب مساله هفتم

یکشنبه 3 مرداد 1389 09:37 بعد از ظهرنویسنده : فرهاد

 

سلام

امروز گفتم جوابو دیر تر بذارم شاید بیشتر رو مساله فكر كنیم.

خیلی ها  هم خوب جواب دادند البته جسته گریخته!!!

ولی باید بگم خیلی خوب بود.

سوال بعدی فردا

درست قبل از ظهر . فقط یك فاصله ی زمانی مشخص وجود دارد كه طی آن ، ساعت سه نوبت و به فاصله ی هر نیم ساعت یك بار به صدا در می آید . این فاصله ی زمانی عبارت است از 12:30 ، 1 و 1:30 . پس سه نوبت از چهار نوبتی كه ایوانف فقط تك زنگ را می شنیده است ، موارد بالا بوده اند. اما نوبت چهارم چطور؟ ایوانف می بایست زمانی در دفتر را باز كرده باشد كه ساعت راس ساعت 12 ، آخرین زنگ از مجموع 12 زنگ گفته شده را نواخته باشد.به دلیل وجود اسباب و اثاثیه در صدا گیر او قادر نبود كه 11 زنگ دیگر را بشنود. آیا تك زنگ چهارم می توانسته ساعت 2 بعد از ظهر باشد؟ خیر . زیرا در این زمان ، ایوانف در دفتر باز گذاشته بود و می توانست صدای زنگ ساعت ( ساعت 2 ) را بشنود.


آخرین ویرایش: - -

 
شنبه 31 تیر 1396 08:40 قبل از ظهر
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پنجشنبه 21 اردیبهشت 1396 06:40 بعد از ظهر
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دوشنبه 4 مرداد 1389 10:49 قبل از ظهر
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