Download 106 final exam

King Saud University
Final exam 1427-1428
College of science
106physics
Physics department
Student name:
Student number
Please write your choice (a ,b ,c ,d ) for each question in this table
1
2
3
4
5
6
7
8
9
10
18
19
20
21
22
23
24
25
26
27
35
Total
11
28
12
13
14
15
16
17
29
30
31
32
33
34
1
Choose the correct answer. (Write your choices in the table given in the cove page, any answer
not written on that table will not be counted).
1) A motorcycle accelerates from 10 m/s to 25 m/s in 5 seconds. the average acceleration of the bike
is a) 3m/s2
b)5m/s2
c)15m/s2
d)25m/s2
2) A boy walks 150 meters due east and then turns around and walks 30 meters due west.
The boy's displacement is
a. 30 meters east
b) 150 meters east
c). 120 meters east
d.) 180 meters west
3) A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110
m. the acceleration of the car. Is
a) 8.1m/s2
b) 20m/s2
c) 2m/s2
d)12m/s2
4) A force of F on a mass- m -causes an acceleration of 16 m/s2 the acceleration will result from a
force of one-half F on a mass of one-fourth M is
a) 8m/s2
b)16m/s2
c)32m/s2
d) 2
5) The x and y components of a displacement vector are 4.65 m and 6.57 m respectively. The angle
does the vector make with the x axis is
a) 47°
b)23.5°
c)54.7°
2
d)85.7°
6) A train on a straight track traveled 60.0 km/h to east for 2.00 h, stopped for 15 min, then
traveled 100.0 km west at 133 km/h.
the train's average velocity for the whole trip is
a)6.67km/h
b) 73.3km/h
c) 64.3km/h
d)
40km/h
7) A ball fall from a roof to the ground 7.0 m below its take
a) 4s
b) 7s
c) 1.2s
d) 3.2s
8) A 4kg object is moving across a frictionless surface with a constant velocity of 2 m/s. the force
necessary to maintain this state of motion is
a) 4N
b) 2N
c) 0 N
d) 8N
9) 25.0 kg block is pulled along a frictionless horizontal surface by a string. The string
makes an angle of 30º to the horizontal and is pulled by a 100 N force. The acceleration of
the block is :
a)3.64 m/s2
b) 4.5m/s2
c) 9.8m/s2
d) 1.9m/s2
10) Person lifts a heavy load to a vertical height of 2,0 m in 3 seconds. If he/she had done this more
slowly in 6 seconds, the work on the load would have been:
11)A girl runs up one flight of steps. Which one of the following factors does not affect the work
done by the girl against gravity?
12) Relative to the force needed to keep a box moving at constant velocity across a floor, to start
the box moving usually needs
a) less force
b) the same force
natures of the surface in contact
c) more force
d) any of the above ,depending
13) A force of 300N is sufficient to keep a100kg wooden crate moving at constant velocity across a
Wooden floor, the coefficient of kinetic friction is
a) 0.306
b) 0.44
c) 0.01
d) 0.0
14) A horse has a power output of 1kw when it pulls a wagon with a force of 400N the wagon
Velocity is
a) 4m/s
b) 7m/s
c) 2.5m/s
d) 5.5m/s
3
15) To raise 200kg steel beam to a height of 10m on bridge being built requires wok of
a) 2kJ
b) 19.8kJ
c) 10kJ
d) 98kJ
16) The velocity of a 5000kg truck whose KE is 360kJ is
a) 12km/h
b)31.5 km/h
c) 43.2km/h
d) 144km/h
17) An in elastic collision con serves
a) momentum but not KE
b) KE but not momentum
d) neither momentum nor KE
18)
c) both momentum and KE