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السلام عليكم ورحمة الله وبركااته ..

كيفكم ان شاءالله طيبين ,,
انا عندي كم تمرين بالفيزياء الطبيه أبي حلهااا قبل يوم السبت بليز وحكوون شاكره لكم ,, الدكتور اعطانا التمارين وقال حلوها وراح اعمل لكم كويز فيها يوم السبت لذلك ابي حلها سريعاً لا هنتوا ,,

====> إليكم التمارين من كتاب "kane and sternheim physics .third edition. "

1- (1-50) من الشابتر الأول:
A racing initially at rest has a conatant acceleration for 0.5 Km
its speed at the end of this period is 100 m/s
a\ What is the acceleration of the car
B\ How long does it require to cover the 0.5 Km distance



من الشابتر الثاني :
يوجد رسمة للسؤال سأحاول وضعها لاحقاَ

2.13
For the vectors in fig.2.22 find the magnitude and direction of
A\ D=A+B+C
B\ E=A-B-C

2.15

A car goes around a circular track 500 m in diameter at a constant speed of 20 m/s
A\ How long does it take for the car to go halfway around the track
B\ What is its average velocity in that time interval


2.19
A plane flies south at 500 Km/h for 2h and then flies west at 500 Km/h west for 1h
A\ What is its average speed
B\ What are the magnitude and direction of its average velocity


من شابتر الثالث :

3.49


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
weight 8000 N , What is the maximum possible vertical acceleration of the elevator



3.54


In a collision , an automobile of mass 1000 Kg stops with constant acceleration in 2m from an initial speed of 20 m\s
A\ What is the acceleration of car
B\ What is the net forceon the car during the collision






وبليــز أبي حلها قبل يووم السبت والله يعين ويوفق الجميع

[طبيبة صآبره]

ماافي ولا حل لحين بليز انا طالبه مسااعدتكم والله يجزاكم عني خير الجزااء

[Einstein Uae]

بسم الله الرحمن الرحيم

وعليكم السلام ورحمة الله وبركاته

الحمدالله ربي يسلمج انتي كيفج ان شاء الله مرتاحه إختي ...

Question 1


a) Use this equation to solve for acceleration

vf^2 = vi^2 + 2ax

Where vf is the final velocity
vi is the initial velocity
a is the acceleration
x is the distance moved


b) Now use this equation to find the time needed to cross that distance

vf= vi + a*t

[Einstein Uae]

Question 2

please post the diagram as soon as possible

[Einstein Uae]

Question 3

a) to find the time taken for the halfway distance of the circular track we simply have to find the distance of the full circular track then divide it by two. As we know that distance travelled by car in one full orbit or revolution is = circumference of the cirlce = 2 * Pi * r

So for the halfway it must be the half of that equation so it becomes like this

Circumference of half circle = Pi * r


Find r by dividing the diameter by two . Then substitute its value in the circumference equation, and you get the distance.

Then use this equation to solve for the time needen

time = distance / speed


b) Not sure about this part ::

Average velocity = Displacement / Time taken

I think that the displacement here is basiclly the distance traveled that we have found in part a and the time taken also found in part a so it may be the of speed which is 20 m/s . Please Check the answer.

[Einstein Uae]

Question 4

part a ) find the average speed which is = total distance / total time

find the total distance : distance to the south + distance to the west
find the total time : time taken to the south + time taken to the west


part b ) Find the magnitude & direction of average velocity

magnitude = total displacement / total time
direction = same as the direction of the displacement ( I Think )

find the total displacement which is the difference distance between the west and south.
total time is the same that found out in part a .

[طبيبة صآبره]

شكراااااااااااا كثير كثير والله يوفقك ان شاءالله حلك جدا راائع ومفهوووم واذا فيه أي شي صعب علي راح اقولك سوووري اذا تعبتك .. وشكرااا مره ثانيه

[طبيبة صآبره]

معليه أخوي بس حل السؤال الخامس والسادس مو موجود...؟

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في فقره a من السؤال الرابع عندي ناتجها رقما فقط من دون الطريقه وكان 500km/hبافتراض ان الوقت يساوي ساعتين ,, هل هذا الحل صحيح .؟


وفي فقره b لما ناخذ الفرق بين المسافتين يكون الناتج صفر وبالتالي لا توجد قيمه هل هذا صحيح .؟؟ مع العلم ان الحل موجود في الكتاب وهو يساوي 372,7 km/h

[Einstein Uae]

بسم الله الرحمن الرحيم

أنا حليت واحد من السؤالين في فتره مضت ما اذكر السؤال الخامس او السادس تأكدي من هذا الرابط

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