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فیزیک دوم دبیرستان - سؤالات حل شده

فیزیک دوم دبیرستان

اموزش کامل فیزیک دوم برای دانش اموزان ایرانی هدف اصلی من است

یکشنبه 28 خرداد 1391

سؤالات حل شده

نویسنده: محمد مهدی نوریزاده   طبقه بندی: نمونه سوال امتحانی فصل پنجم، 

سؤالات حل شده

۱ – برای اندازه گیری فشار گاز داخل یک محفظه از یک لوله u شکل حاوی جیوه مطابق شکل استفاده می شود. اگر اختلاف ارتفاع بین سطح مایع در دو لوله 50 سانتیمتر باشد فشار گاز داخل محفظه چند پاسکال است؟ فشار گاز داخل محفظه چند سانتی متر جیوه است؟

( فشار هوا   pa 10و چگالی جیوه  13600kg/m3 و g =10N/kg )

 

 

P= p0+ ρgh

P= 105+(13600×10×0/5)

P= 1/68 ×105pa فشار داخل محفظه

 

P = ρgh

1/68×105= 13600×10× h Þ  h = 1/23 m Þ  h= 123 cm Hg

 

2 – اگر به جای جیوه از آب در فشارسنج استفاده شود، ارتفاع آب در لوله در سطح تراز دریا چقدر می شود؟

(چگالی جیوه kg/m3 13600 و چگالی آب kg/m3 1000 می باشد.)

ارتفاع جیوه در سطح دریا 760 میلیمتر است 1000/760 (m

 

(ρgh) آب=( ρgh)جیوه

ρhآب  ρh جیوه

1000× h آب= 13600×0/76

 H آب= 10/33 m

ملاحظه می کنید که ارتفاع آب به بیش از 10 متر در سطح تراز دریا می رسد پس آب مایع خوبی برای فشار سنج نیست.

 

3 – جسم جامدی به شکل مکعب مستطیل با ابعاد 2و3و5 متر روی سطح زمین قرار دارد. اگر چگالی جسم kg/m3800 باشد.

الف) جرم جسم را محاسبه کنید.

ب) در چه شرایطی جسم کمترین فشار را بر سطح وارد می کند؟

این فشار را محاسبه کنید.

 

 

الف) v=2×3×5 = 30m3

 

ρ= M/V Þ  m = ρv = 800×30=24000kg

 

ب) جسم هنگامی که بیشترین سطح تماس را با زمین داشته باشد، کمترین فشار را بر سطح وارد می کند.

A= 5×3=15m2

 

نیرویی که به سطح وارد می شود نیروی وزن جسم می باشد. پس:

 

P = F/A = mg/A = 24000*10/15  = 1600Pa

 

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