King Abdulaziz University Faculty of Sciences
Physics Department First Exam - Phys 110
Second Term 1432-1433 H
Date: 13/ 4 / 1433H
B
Name: ID No: Section:
CHOOSE THE CORRECT ANSWER 1. If a=2iˆ+2jˆ
and b = +iˆ 3kˆ
,then a b× =
a) ˆ2i −6jˆ−2kˆ b) ˆ6i −2jˆ−6kˆ c) ˆ2i − jˆ−6kˆ d) 6iˆ−6jˆ−2kˆ 2. Convert 5.86 x 106 cm to kmcm to kmcm to kmcm to km
a) 58.6 km b) 5.86 km c) 586 km d) 0.586 km
3. An object is thrown straight up from ground level and reached its highest point after 3.4 s . Its initial velocityIts initial velocityIts initial velocity is:Its initial velocity
a) 33.32 m/s b) 35.3 m/s c) 43.31 m/s d) 30.32 m/s
4. A car moved a distance of 215 km ,in a direction making an angle of 220 east of north . How far east and north has the car moved?
a) 91 km east, and 188 km north c) 188 km east, and 91 km north b) 81 km east, and 199 km north d) 199 km east, and 81km north 5. In the following sentences, which one iswhich one iswhich one iswhich one is wrongwrongwrong? wrong
" the free fall acceleration ..."
a) is equal to zero at the highest point.
b) is the same for all objects.
c) has a magnitude of 9.8 m/ss.
d) is the same during ascent and descent.
6. A particle enters a region with a speed of 4 x 106 m/s and then slowed at the rate of -1.5 x 1012 m/s2 . The distance the particle takes to stopThe distance the particle takes to stopThe distance the particle takes to stopThe distance the particle takes to stop is
7. A particle's position on x-axis is: x t( ) 13 24= − t +2t3 with x x x in meters and t x t t in t seconds. Its acceleration at t = Its acceleration at t = Its acceleration at t = Its acceleration at t = 5555 s is s is s is s is:
a) 52 m/s2 b) 36 m/s2 c) 60 m/s2 d) 12 m/s2 Use the following to answer questions 8-9:
A particle moves from y A particle moves from y A particle moves from y
A particle moves from y1111 = - = - 5555 m to y= - = - m to y m to y m to y2222 = - = - 2222 m= - = - m m m
8. The directionThe direction of the displacement is:The directionThe direction a) left b) right c) up d) down 9. The magnitudeThe magnitude of the displacement is:The magnitudeThe magnitude
a) 7 m b) -7 m c) -3 m d) 3 m 10. For the following two vectors: A =2iˆ+3jˆ
, B = −3iˆ+2jˆ
. Find A⋅2B
a) zero b) 5 c) 12 d) 6
11. Here are three vectors in meters d1 =3iˆ−3jˆ
, d2 = −iˆ jˆ
,and d3 =2iˆ−4jˆ
.
What is the result of What is the result of What is the result of
What is the result of d1⋅
(
d2+d3)
a) 24 m b) 14 m c) 4 m d) 34 m
12. A car can go from zero to 32 m/s in 16 s. The average accelerationThe average accelerationThe average accelerationThe average acceleration of the car is:
a) 4 m/s2 b) 7 m/s2 c) 3 m/s2 d) 2 m/s2
13. The conversion factorThe conversion factor used to convert a volume of 64 cmThe conversion factorThe conversion factor 3 to SI units is
a) 12 10
m
cm b)
3
6 3
1 10
m
cm c)
6 3
3
10 1
cm
m d) 102
1 cm m
14. If ˆ ˆ ˆ
x y z
a=a i +a j +a k
, the quantities
(
a a ax, y, z)
are called:a) vector components c) scalar components
b) unit vectors d) vector sum
15. A change from an initial position to a final position is called:
a) velocity b) acceleration c) speed d) displacement 16. A particle's position on x-axis is: 2
2 4
( ) 9
x t =t −t + with x x x x in meters and tttt in seconds. Its position at t = Its position at t = Its position at t = Its position at t = 3333 s is s is s is s is
a) 6.87 m b) 10.34 m c) 9.37 m d) 7.89 m Use the following to answer questions 17-18:
Two vectors:
Two vectors:
Two vectors:
Two vectors: A =3iˆ+2jˆ
and and and and C =5iˆ
17. The angle between vector A
and vector C is:
a) 1370 b) 37.30 c) 33.70 d) 1300 18. The angle between vector A
and the x axis is:
a) 30.90 b) 56.30 c) 33.70 d) 21.80 19. If a=4iˆ−3jˆ
and b =6iˆ−8jˆ
,then the magnitude of b −a =
a) 14.87 b) 18.9 c) 5.4 d) 12.5 20. How many secondssecondssecondsseconds are in 36363636 days days days days
a) 31.104 x 104 s c) 31.104 x 102 s b) 31.104 x 105 s d) 31.104 x 106 s Use the following to answer questions 21-22:
Two vectors, Two vectors, Two vectors,
Two vectors, C and D,
, have magnitudes , have magnitudes , have magnitudes
, have magnitudes C =16m
,and ,and ,and ,and D =78m
21. If the vectors are anti-parallel(anti-parallel(anti-parallel(anti-parallel( )))), Their vector sum has a magnitude =
a) 94 m b) 80 m c) 0 d) 62 m
22. If the vectors are perpendicularvectors are perpendicularvectors are perpendicularvectors are perpendicular, their vector sum has a magnitude =
23. From the figure, the angle that vector a
makes with the +x axis (counterclockwise)is:
a) 1500 b) 300 c) 1200 d) 2100 24. In the diagram, the magnitude of A =12m
, the magnitude of B =10m
and the magnitude of C =6m
. The x component of A+B +C =
a) 11 m b) 28 m c) 23 m d) 17 m 25. In which figure of the following C
is the vector sum?
a) c)
b) d)
26. Electric power of magnitude 2.17 x 109 watts equals:
a) 2.17 megawatts c) 2.17 gigawatts
b) 2.17nanowatts d) 2.17 kilowatts
27. If A
= 44 units, B
= 16 units, and the angle φ=30°, then the vector product C =A×B
is a) C =532
units, parallel to A
and B
b) C =352
units, parallel to A
and B
c) C =352
units, perpendicular to A
and B
d) C =532
units, perpendicular to A
and B
28. The density of silver is 10.49 g/cm3 , its density in kg/m3 equals:
a) 10.49 x 10-6 kg/m3 c) 10.49 x 103 kg/m3 b) 10.49 x 106 kg/m3 d) 10.49 x 10-3 kg/m3
29. An apple fell from a 19.6 m tree, how long did it take to reach the ground how long did it take to reach the ground how long did it take to reach the ground how long did it take to reach the ground level?
level? level?
level?
a) 4 s b) 9.8 s c) 2 s d) 4.9 s 30. If A =3iˆ−3jˆ
, B =iˆ−2jˆ
,and C =5iˆ−12jˆ then A−2B +C =
a) ˆi + jˆ b) 6iˆ−11jˆ c) ˆ9i +17jˆ d) ˆ8i −17jˆ
31. A man drives a truck from a gasoline station a long a straight road for 11.2 km in 0.23 h , then he returns back to the station in 45 min , his average average average average speed and average velocity , respectively
speed and average velocity , respectivelyspeed and average velocity , respectively speed and average velocity , respectively, are :
a) savg = 12.7 km/h , vavg = 0 c) savg = 0 , vavg = 22.86 km/h b) savg = 0 , vavg = 12.7 km/h d) savg = 22.86 km/h , vavg = 0 32. The speedThe speed of a particle moving with instantaneous velocity of - 15 m/s is:The speedThe speed
a) 10 m/s b) 5 m/s c) 12 m/s d) 15 m/s
33. If C =35iˆ+21jˆ−14kˆ
, then then then then 2 7 C =
a) ˆ5i +3jˆ−2kˆ b) 10iˆ+3jˆ−4kˆ c) 10iˆ+6jˆ−4kˆ d) ˆ6i +6jˆ−10kˆ
Answer Key
1. d 2. a 3. a 4. b 5. a 6. a 7. c 8. c 9. d 10. a 11. a 12. d 13. b 14. c 15. d 16. d 17. c 18. c 19. c 20. b 21. d 22. c 23. d 24. a 25. c 26. c 27. c 28. c 29. c 30. b 31. d 32. d 33. c
