بليزززززززززز ضروري بسرعه

[اسيرة بغداد]

هذي اسئلة فيزياء في نهاية الفصل
ياليت احد يحلها لي
او يقولي وين القى الحل بليزززززززز
السبت عندي اختبار واسئلة هذي معانا
بليزززززززززززززززززززززززز
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17-3
the nucleus of a uranium atom is approximately described as a sphere of
radius 8.7*10^-15m and of mass 3.5*10^-25kg
a-what is its average density
b-what is its specific gravity
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49-3
an elevator cable that is light in weight compared to the elevator car can support a weight of 10,000 N. if the elevator and occupants weigh 8000N, what is the maximum possible vertical acceleation of the elevator
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54-3
in a collision,an automobile of mass 1000kg stops with constant acceleration in 2 m from an initial speed of 20m/s
a-what is the acceleration of the car
b- what is the net force on the car during the collision
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بليز ساعدوني ابغى الحل ضروري
واذا احد عنده حلووول حقت الكتاب يقولي عليها من وين اشتريها او يحطها الي في مكتبه وانا اصورها بليززززززز

[Einstein Uae]

بسم الله الرحمن الرحيم

السلام عليكم ورحمة الله وبركاته


Question 1


Part a) density = mass/volume , ρ = m / V

Mass is given , Volume of sphere is = (4/3)*pi*r^3

Part b) Specific gravity = density of fluid or substance / density of water , SG = = ρ / ρH2O

density of fluid or substance we have found it in part a
density of water we knew it as 1000 kg/m^3

يرجى التأكد من الإجابات .. وإن شاء الله تكون صحيحه ووفقك الله

[Einstein Uae]

حل السؤال الثالث

http://phys4arab.net/vb/showthread.php?t=42164