[متفائله]

السلام عليكم ورحمة الله وبركاته
لو سمحتوا في نماذج اختبارات سابقه وأبي منكم الحل

النموذج الأول

أختر الإجابة الصحيحة في الأسئلة 1-5
Question1:
A 0.50 kg mass is attached to the end of a string rotates in a vertical circle (radius=2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s . What is the magnitude of the force of the string on the mass at that position?
(a) 31N (b) 36N (c) 41N (d) 46N (e) 23N

Question2:
A 3.0 kg block is dragged over a rough horizontal surface by a constant force of 16N acting at an angle of 37o above the horizontal. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
(a) –34J (b) –64J (c) –30J (d) +60J (e) +64J
Question 3:
A 2.0 kg block is attached to a spring (K=1000 N/m) and the other end of the spring is fixed. The speed of the block as it slides through the equilibrium position of the spring is 5.0 m/s . What is the kinetic energy of the block after it slides 20 cm beyond the equilibrium position?

(a) 45J (b) 16J (c) 29J (d) 5.0J ( e) 20J
Question 4:
A block (mass=m) is suspended from the ceiling by a string that has a length of 2.0 m then it starts swinging. If the speed of the block at the lowest point is 4 m/s. What is the maximum angle does the string make with the vertical as it swings?
a) 61o (b) 54o (c) 69o (d) 77o (e) 47o
Question 5:
A 2.0 kg mass is moving with a speed of 5 m/s collides with a 8 kg mass initially at rest and stick with it. What is lost energy because of collision?
(a) - 20 J (b) 15 J (c)- 30 J (d) 25 J (e)- 5 J

أجب عن السؤال التالي في نفس الورقة
Question 6:
A block is moving with a speed of 5.0 m/s collides with another block which has the same mass. After the collision the speed of the first block was 4.3 m/s with an angle of 30o relative to it initial path before the collision.
a) the speed and direction of the second block.
b) is the collision elastic?





النموذج الثاني
أختر الإجابة الصحيحة في الأسئلة 1-7 GA
Question1:
A rocket is thrown from a height of 60 m vertically downward with an initial speed of 10 m/s, at the same time another rocket is thrown from the ground vertically upward with an initial speed of 40 m/s. The two rockets will meet at a height of:
(a) 53 m (b) 41 m (c) 57 m (d) 46 m (e) 37 m
Question2:
A projectile is fired with an initial velocity of 80 m/s to strike a target 450 m at the same level of the projection point. The total flying time for the projectile is:
(a) 9.0s (b) 6.9s (c) 7.8s (d) 6.1s (e) 5.6s
Question3:
A block is sliding down a 27o incline. If the block starts from rest and makes 6 m in 2s,then the coefficient of kinetic friction between the block and the incline is:
(a) 0.28 (b) 0.22 (c) 0.17 (d) 0.35 (e) 0.12
Question 4:
A 2.0 kg mass is attached to the end of a string then starts moving in a vertical circle (radius=80 cm). If its speed at the highest point is 4.5 m/s, then the tension on the string at that point is:
(a(70 N (b) 20 N (c) 31 N (d) 51 N (e) 66 N
Question5:
A 2.0 kg block is moving on a horizontal surface toward a spring (k=2000 N/m) which is fixed to a wall. The speed of the block just when it reaches the spring is 6 m/s. the speed of the block when the spring is pressed 15 cm is:
(a) 3.7 m/s (b) 4.4 m/s (c) 4.9 m/s (d) 5.4 m/s (e) 7.4 m/s
Question6:
A block (mass=m) is suspended from the ceiling by a string (2m). It starts swinging if the speed of the block at lowest point is 4 m/s, then the maximum angle the string makes with the vertical is:
(a) 61o (b) 54o (c) 69o (d) 77o (e) 47o
Question7:
A 2.0kg mass is moving with a speed of 5.0 m/s collides with a 8 kg mass initially at rest and stick with it. If the motion is one dimension, the lost energy because of collision is:
(a) 20 J (b) 15 J (c) 30 J (d) 25 J (e) 5 J

Answer the following two questions on the same paper
Question8:
A spring (k=5000 N/m) is fixed at the bottom of a 30o rough incline. The spring is pressed 10 cm and a 2.0 kg block is placed on the spring the spring is released so it pushes the block to move 2.0 m then it stops.
A ) the potential energy of the spring b)the work of the friction force c) work of gravity d)the coefficient of kinetic friction between the block and the incline

Section B
Answer the following question
a) A bag of cement of weight 325 N hangs from three wires s shown in the figure
below .Two wires make angles 71=600 and 72=250 with the horizontal. If the system is in equilibrium, find T1, T2, and T3 in the wires.


b) A car, with mass m, is traveling at 50 mi/h on a horizontal highway. (a) If the
coefficient of static friction between road and tires on a rainy day is 0.100, what is the
minimum distance in which the car will stop? (b) What is the stopping distance when
the surface is dry and s = 0.600? [1 mi = 1.6 km]

النموذج الثالث

## Answer on the same paper, and show your work ##
Section A
Make a circle around the correct answer
1) A particle moves along the x axis according to the equation X (t) = 2.00 + 2.00 t –
1.00 t2, where x is in meters and t is in seconds. its acceleration, when t=3.0 s is
a) zero b) 2.0 m/s2 c) – 6.0 m/s2 d) – 2.0 m/s2

2) A 3.00-kg object is moving in a plane, with acceleration a=8.0i - 6.0j m/s2,
the magnitude of the net force acting on the object is
a) 30 N b) 16 N c) 108 N d) 300 N

3) A particle moves at a constant speed in a circular path with a diameter of 4 cm. If
the particle makes four revolutions each second, the magnitude of its radial
acceleration is
a) 12.6 m/s2 b) 0.5 m/s2 c) 20 m/s2 d) 25.3 m/s2

4) A ball is thrown up vertically with initial speed. If it takes the ball 1.5 s to reach the
maximum height, the maximum height reached by the ball is
a) 6.32 m b) 11.03 m c) 22.5 m d) 14.7 m
2) A projectile is fired at 30° above the horizontal with initial speed of 20 m/s. The
horizontal displacement that it covers when it reaches the maximum height is equal
to:
a) 0.88 m b) 35.3 m c) 17.7 m d) 20.39 m[/LEFT]

[بدايات الفجر]

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[Einstein Uae]

بسم الله الرحمن الرحيم

وعليكم السلام ورحمة الله وبركاته

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[Einstein Uae]

قليل من المساعدة ...

النموذج الأول ... السؤال الأول

Weight (down) + centrifugal force (down) = Force (up)

Weight (down) = m*g

centrifugal force (down) = m*v^2 / r

Force (up) = F

Find Force ...