[Burayh]

بليز الحل ضروري اليوم قبل بكره عندنا تسليم الاوراق وانا ما عرف احل هذه الاسئلة الفيزيائية
الرجاء مساعدتي




- Show how to convert Newton into dyne or prove that 1N=10^5 dyne.
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2- Show that 1J=10^7 erg.
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3- Find the relation between each of the following
a) Joule and Newton b) Newton and Pascal
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4- Write down the dimensional equation for each of the following quantities and find
their units: Power - momentum – pressure.
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5- Check the following mathematical relations
a) E= mv^2 + F/V [E: energy ،٬ m:mass ،٬ v:speed ،٬ F:force ،٬ V: volume]
b) P=r g h [r density ،٬ g acceleration h height]
c) X = vt + ½ at^2 [X: distance ،٬ v: speed t: time a : acceleration].
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A truck on a straight road starts from rest, accelerating at
2.00 m/s2 until it reaches a speed of 20.0 m/s. Then the
truck travels for 20.0 s at constant speed until the brakes are
applied, stopping the truck in a uniform manner in an additional
5.00 s. (a) How long is the truck in motion? (b) What
is the average velocity of the truck for the motion described؟

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An automobile travels on a straight road for 40 km at 30 km/h. It then continues in the
same direction for another 40 km at 60 km/h. (a) what is the average velocity of the car
during this 80 km trip? (Assume that it moves in the positive x direction.) (b) What is the
average speed?
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The position of an object moving along an x axis is given
by x = 3t - 4t^2 * t^3,where r is in meters and / in seconds. Find
the position of the object at the following values of r: (a) 1 s,
(b) 2 s, (.) 3 s, and (d) 4 s. (") What is the object's
displacement betweerr t = 0 and t = 4 s? (f) What is its average
velocity for the time interval from t= 2s to t=4s?

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A hot-air balloon is ascending at the rate of 12 m/s and
is 80 m above the ground when a package is dropped over the
side. (a) How long does the package take to reach the ground?
(b) With what speed does it hit the ground

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a baseball is hit so that it travels straight upward after being struck by the bat . a fan observes that it takes 3.00 S for the ball to reach it's maximum height . find ( a) it's initial velocity and ( b) the height it reaches

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[فطوومة]

السلام عليكم ورحمة الله

بالنسبة للسؤال الأول والثاني ما اعرف (dyne, erg)
3-
بما أن الشغل عبارة عن القوة في الإزاحة W=F.X و وحدته Jule والقوة وحدتها Newten
إذا العلاقة بين جول ونيوتن : 1J= 1N.M

العلاقة بين نيوان وباسكال اللي هو وحدة الضغط من العلاقة التالية أيضا،،
P=F/X إذا 1 Pascal = 1N/M


4-
Power equation : powe = work / time it's unit : p=N.M/S

momentum equation : P= m.v it's unit : p= kg.m/s

Pressure equation : p= F/X it's unit : p=N/m

5-

السؤال الخامس تعوض بدل كل كمية وحدتها وتحلها رياضيا بتوحيد مقامات وجمع وضرب حسب العلاقات ثم تنظر للوحدة الناتجة هل تساوي وحدة الكمية المعطاة!

* ودائما تذكر أن تجانس الوحدات ليس بالضرورة أن يتبعه تجانس في الكميات *

6-
سأوضح لك المعطيات وأكمل الحل من قوانين الحركة
Xi = 0, vi=0, vf=2, ai= 2, af=0

أتمنى أكون أفدتك ،، بالتوفيق