I
Physics Department
Physics 101
Exam I
Summer 2016
Sunday, June 12, 2016
8:30p.m . - 10:00 p .m.
Stud ent's Name: . . .......... . ....
K~. . . ... . ... ... . . . . ..... . . . . . . ... . ... . ... . . . . . . .
Student's Number: ............ ..... ... . .... .. ... . . . .... .. ... . ... .... ............ . .. . .. .. .. ...... . .. .. . . . . ..... . .
Section number: .. ... .. .. .
Choose your Instructo r's Name:
Prof. Yacob Makdisi
Dr. Abdul Khaliq Smadi
Dr. Bela! Salama
Dr. Fatrna Al-Dossari
Dr. Tareq Alrefae
#
Q1
Q2
Q3
Q-l
QS
SP1
SP2
SP3
SN
SPS
SP6
SP7
SP8
SP9
SP10
To ta l
1
1
1
1
1
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
20
Pts
Important:
1.
2.
3.
4.
5.
6.
7.
Answer all questions a nd problems.
Each question is assigned 1 point.
Each short problem is assigned 1.5 points.
No solution = no points.
Assume g = 10 m/s 2 •
Mobiles and pagers are not allowed during the exam.
Programmable calculators, which can store equations, are n o t allowed.
GOOD LUCK*
Kuwait Un iversity - Science College - Physics dept. - PHYS 101
Sum mer 20 16 (J une 12. 20 16)
Select the correct answer for each of the following questions ( l point each)
· 1. A ball is thrown upward from the top of a building as shown. The ball 's displace ment is zero at
the position:
b•
(a) a
(b) b
c
(
a•~c
(c) c
~a)
\
' '
' '
' '
a
:d
e) e
'
'
'
'
'
~e
2.
The velocity of a particle moving along the x axis as a function of time is described in the shown
graph. What can be said about the particle' s displacement and acceleration (L1x,a,)?
\~a~ (+,+lJ
6
(+,0)
(c) (0,+)
Vx
(d)(+,-)
(e)(-,+)
t
3. A ball swings in a vertical circle with a varying speed . At
the shown position, the direction of the ball ' s total
acceleration is
(a)
~
(b)__.
(c) +--
(d)/
•'
Kuwait University - Sc ience Co llege - Phys ics dept. - PHYS 101
Summer 20 16 (June 12, 20 16)
4. A box is moving to the right with a decreasing acceleration. At time 11, the acceleration becomes
constant. If at all times the acceleration ofthe box is positive, then the velocity:
(a) decreases untilt 1, then becomes
constant
(b) increases until time 11. then becomes
constant.
[(c) mcreases at a!: timeS':'\
(d) decreases unt1 11, then becomes zero.
(e) increases untilt 1, then becomes zero.
5.
1
The speed of a projectile at the maximum height is v y.
4
The angle of projection () in degrees is
'
1'/r
-'( \J•'1 )
"·'11~
e = +OJ-'
(a) 27
(b) 56
(c) 63_
.-·· ·- ·· ······· · ·.
LJ
···•· ..•
.
·-.
l "Jx
(dl7~\
(e) Undeterminable
Solve the following short problems. Show your
work. No solution = no points (1.5 points each)
1. It takes timet for a ball to be dropped from a height of h to reach the ground. How long does
it take the ball (in terms oft) to reach the ground if it is dropped from a height of 3h.
'h = -::rI ~ t 'l.
~
~/
~f-t
\1
3h
::
CJ
'2,
t,
..,_
~
t_'
= (3 t
~~/)
Answer
nt
2. A car covers a distance of 40 min 8.5 s wh ile uniformly slowing down to a final speed of2.80
m/s. Find the car's acceleration (in m/s 2) .
r.5pt -,
.. ·
v:-2
.S!::
I
S
----------~--------
Answer
-o.4~ v~-/s""
Kuwait University - Science Coll ege - Phys ics dept. - PHYS I0 I
Su mmer 20 16 (June 12, 20 16)
3. The pilot of an airplane wishes to fly due west in a wind blowing at 50 km/h toward the south.
lfthe speed ofthe airplane in the absence of a wind is 200 km/h, find the speed ofthe airplane
relative to ground (in kmlh).
,...J
-J
_J
VP/rr = Vp/A + VPtjr.r
IVr;6- ) = { 20C:-
<;o.:
Answer
: I CfY ~
I q'4
t;,...-f "~
"'
A man walks at a constant speed of 5 m/s along a straight line from point A to point B, then
back from point B to point A at a constant speed of 3 m/s. Find the man 's average speed (in
m/s) over the entire trip.
4.
~
(M}~ s-r~~J
~r)
-----~ -
--
--
J,s1
-·- ---·--
3 !:.~ :. \h.
.....,
2 'J, t,
-t\+t1..
'2 \),
--=---//s e~ J
\ ~ !:=
'0 -
___ ___
+,~~
1
/
'3.'15"~
Answer
3-1~ ~~-{
-t:l
5. The minute arm of a clock is 36 em in length. Find the average speed of the tip of the arm.
-
_.
Answer
_'3
0,
b3
~tO
..
Ku11ail University - Science College - Physics depl. - PHYS I0 I
6.
Summer 20 16 (June 12, 2016)
For the shown figure , find the magnitude of the vector
A+B+c+/5
~-&_ =~ .. + (3)1 + C-,t +'Dx J L+(A., +6~ + c~ +1)..) \
,--
~)
~=
5
" - y "j
_§ L
~
- .'i
(~
Answer
(9.4 u_V:,-h
& \
~~ -- b.t1
('
,
8
";(
",_
- .'i
.1 allis
7. A particle is moving in a straight line according to the function x = 50 1- 5 1 2, where x 1s m
meters and 1 is in seconds. Find the average speed of the particle during the time interval t 1 = 0
to t2 = 6 seconds.
Answer
;:::.
-2
L1 -15
8. At t =0, a particle leaves the origin with a velocity of 6 j mls. The acceleration of the particle is
(2i- 3]) m/s2 • When the particle reaches its maximum y coordinate,
constant, and is equal to
find the particle' s speed (in m/s).
a=
Answer
LJ
~~r~ l
·~ 5~~ "
vv: ~" ;;
v,
I,J-Is
<;
..
Kuwail Uni versity - Sc ience Co llege - Physics dcpl. - PHYS I0 I
Summer 20 16 (Jum: 12. 20 16)
9. The figure shows the velocity graph of a particle moving along the x-axis. Find the magnitude of
the avera e velocit (in m/s) of the article durin the first I 0 seconds.
[dfQ )l-*:. ~ (lcJ) -t. ~(I())1M
10
tfs
$'.
Answer
2
w-/s
I 0. At what speed (m/s) must the player shoot the ball, such that it goes right through the hoop
(basket).
----·---
Answer
......