Department of Physics PHY 101 Final Exam JUST 20-8-2011 Name: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _I.D.#: _ _ _ _ _ _ _ _ _ _ _ Section: _ _ _ _ Instructor: _ _ _ _ _ الرقمسلمتسل ال: ---------------- Approximate your solution to those given for each question. Use CAPITAL letters only. Any answer is not in the table will be ignore. Q 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Ans A B C D A C B D B D A B B A C D D A C A Consider g = 10 m/s 2 1. A particle moving with a constant acceleration has a velocity of 20 m/s when its position is x = 4 m. Its position 8.0 s later is x = 3 m. What is the acceleration of the particle in (m/s 2 )? A) - 5 B) - 3.3 C) - 2.5 D) - 8 2. A man walks 8 km south for 4 hours, then 6 km north for 4 hours. What is the average speed of the man (km/h)? A) 2 B) 1.75 C) 1.4 D) 0.25 3. A particle starts from the origin at t = 0 with a velocity of (16 + 12 ) m/s and moves in the xy plane with a constant acceleration of = (3.0 - 6.0 ) m/s 2 . What is the speed of the particle at t = 2.0 s in (m/s)? A) 30.5 B) 48 C) 22 D) 53.9 4. A gun is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target in (m)? A) 1.25 B) 0.6 C) 0.45 D) 0.31 5. The position of an object is given by j t i t r ˆ 6 ˆ 4 3 + - = r , where t is in seconds. At t = 2.0 s, what is the magnitude of the particle’s acceleration (in m/s 2 )? A) 72 B) 108 C) 18 D) 144 6. If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1 (in N)? A) 21 B) 19 C) 17 D) 25 7. A 4.0-kg object is attached to the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the tension in the string in (N)? A) 32 B) 20 C) 40 D) 80 8. A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force (in N) is: A) 4000 B) 5000 C) 2500 D) 2000 9. A car of mass 1850kg is traveling at 20m/s in a straight line. A truck of mass 3700kg has the same momentum as the car. What is the speed of the truck in (m/s)? A) 0.1 B) 10 C) 12.5 D) 15 10. Two vectors A = 6 units and B = 8 units. If A · B = 20, then the angle between the two vectors is: A) 51 o B) 58 o C) 78 o D) 65 o Engines Team اﻟﻤﯿﻜﺎﻧﯿﻜﯿﺔ اﻟﮭﻨﺪﺳﺔ ﻟﺠﻨﺔ
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Department of Physics PHY 101 Final Exam JUST 20-8-2011
Name: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _I.D.#: _ _ _ _ _ _ _ _ _ _ _ Section: _ _ _ _ Instructor: _ _ _ _ _
---------------- : المتسلسل الرقم
Approximate your solution to those given for each question. Use CAPITAL letters only. Any answer is not in the
table will be ignore.
Q 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Ans A B C D A C B D B D A B B A C D D A C A
Consider g = 10 m/s2
1. A particle moving with a constant acceleration has a velocity of 20 m/s when its position is x = 4 m. Its position 8.0 s
later is x = 3 m. What is the acceleration of the particle in (m/s2)?
A) - 5 B) - 3.3 C) - 2.5 D) - 8
2. A man walks 8 km south for 4 hours, then 6 km north for 4 hours. What is the average speed of the man (km/h)?
A) 2 B) 1.75 C) 1.4 D) 0.25
3. A particle starts from the origin at t = 0 with a velocity of (16 + 12 ) m/s and moves in the xy plane with a constant
acceleration of = (3.0 - 6.0 ) m/s2. What is the speed of the particle at t = 2.0 s in (m/s)?
A) 30.5 B) 48 C) 22 D) 53.9
4. A gun is aimed horizontally at the center of a large target 60 m away. The initial
speed of the bullet is 240 m/s. What is the distance from the center of the target to
the point where the bullet strikes the target in (m)?
A) 1.25 B) 0.6 C) 0.45 D) 0.31
5. The position of an object is given by jtitr ˆ6ˆ4 3+−=
r, where t is in seconds. At t = 2.0 s, what is the magnitude
of the particle’s acceleration (in m/s2)?
A) 72 B) 108 C) 18 D) 144
6. If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1 (in
N)?
A) 21 B) 19 C) 17 D) 25
7. A 4.0-kg object is attached to the end of a string rotates in a circular motion on
a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the
radius of the circle is 0.80 m. What is the magnitude of the tension in the string
in (N)?
A) 32 B) 20 C) 40 D) 80
8. A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force (in N) is:
A) 4000 B) 5000 C) 2500 D) 2000
9. A car of mass 1850kg is traveling at 20m/s in a straight line. A truck of mass 3700kg has the same momentum as the
car. What is the speed of the truck in (m/s)?
A) 0.1 B) 10 C) 12.5 D) 15
10. Two vectors A = 6 units and B = 8 units. If A · B = 20, then the angle between the two vectors is:
A) 51o B) 58
o C) 78
o D) 65
o
Engines Team لجنة الھندسة المیكانیكیة
Department of Physics PHY 101 Final Exam JUST 20-8-2011
Name: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _I.D.#: _ _ _ _ _ _ _ _ _ _ _ Section: _ _ _ _ Instructor: _ _ _ _ _
---------------- : المتسلسل الرقم
11. A 0.2 kg bullet is fired horizontally with speed of 200 m/s on a ballistic
pendulum of mass 4 kg. If the bullet embeded inside the pendulum, how high
(in m) will the system rise?
A) 4.6 B) 5.5 C) 6.5 D) 3.7
12. A 0.4 kg ball is fired horizontally in a vertical wall with a speed of 8m/s and
rebounds horizontally with a speed 6m/s. If the contact time between the
ball and the wall is 0.004 s, what is the average force (in N) exerted by the
wall in the block?
A) 2800 B) 1400 C) 5600 D) 700
13. In the conical pendulum shown the mass is 2 kg and the cord length 10 m.
If the angle it makeswith the verticl is 37o, what is the speed of bob in (m/s)?
A) 12.3 B) 6.7 C) 11 D) 9.7
14. A 5g particle rotates with constant angular speed of 8 rad/s in a circle of radius 1.5 m. What is the angular moment of
the particle in (kgm2/s)?
A) 0.09 B) 0.16 C) 0.25 D) 0.64
15. A three- particles system of equal masses. The first particle is located at (8,-4) m and the second particle at ( 0,6) and
the third at (-2,-4). What is the position of the center of mass of the system in (m)?.
A) (0.5, 0.5) B) (3.1, 3.1) C) (2, - 0.7) D)(0.3,0.2)
16. A 1 kg ball dropped from 40m height. If the energy lost due to air resistance is 8 J to reach the ground, what is the
speed (in m/s) of the ball just before it hits the ground?
A) 39.8 B) 34.4 C) 19.6 D) 28
17. A 2 kg solid disk of radius 0.5 m rotates about its axis with constant angular velocity of 25 rev/s. What is
the the speed of a point on the disk at 0.2 m from its center in (m/s)?
A) 20.5 B) 47.1 C) 12.8 D) 31.4
18. A 2 kg rod of length 0.8 m shown in the figure is free to rotate. If the rod
is released from a horizontal position, what is the initial angular
acceleration of the rod in (rad/s2)? The moment of inertia of the rod
rotates about its edge is 1/3 mL2.
A) 18.8 B) 9.4 C) 12.5 D) 37.5
19. A solid sphere (radius R, mass M) rolls without slipping down an incline with
inclination angle of 37o. The linear acceleration of its center of mass(in m/s
2)
is: (I = 2mR2/5)
A) 5.7 B) 3.6 C) 4.3 D) 6.2
20. A 5 kg object moves with constant speed on a horizontal rough surface is
subject to a horizontal force of 18 N. What is the coefficient of kinetic friction
between the object and the surface?
A) 0.36 B) 0.44 C) 0.56 D) 0.68
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
Engines Team لجنة الھندسة المیكانیكیة
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