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IPH401S - INTRODUCTION TO PHYSICS A - 2ND OPP - JAN 2020 |
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1.1 Page 1 |
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NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF ENGINEERING
InSTEM
QUALIFICATION: INTRODUCTION TO SCIENCE, TECHNOLOGY, ENGINEERING AND MATHEMATICS
QUALIFICATION CODE: O04STEM
LEVEL: 4
COURSE CODE: |IPH401S
COURSE NAME: INTRODUCTION TO PHYSICS A
SESSION:
JANUARY 2020
PAPER:
N/A
DURATION:
3 HOURS
MARKS:
100
SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S)
Ms Ilana Malan
Ms Oksana Kachepa
MODERATOR:
Mr Anthony Apata
INSTRUCTIONS
Answer all questions.
Write all the answers in ink.
No books, notes, correction fluid (Tippex) or cell phones allowed.
Pocket calculators are allowed.
You are not allowed to borrow or lend any equipment or stationary.
All FINAL ANSWERS must be rounded off to THREE DECIMAL PLACES.
All CONSTANT VALUES and FORMULAS on page 11.
Use GRAPH PAPER provided for question 16.4
THIS QUESTION PAPER CONSISTS OF 11 PAGES (Excluding this front page)
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1.2 Page 2 |
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SECTION A— TOTAL MARKS 30
This section consists of nine questions. Choose the correct answer and clearly indicate your
answer on your answer sheet.
Question 1
[4]
How much work is required to accelerate a 2.5 t car from 5 km/h to 60 km/h?
(a) 291.763 KJ
(b) 344.81k)
(c) 3781.25 KJ
(d) 347.222kJ
Question 2
[4]
In which quadrant will the equilibrant force of the following be:
dx =-3+2cos10° and
dy =-3 +2cos10°
(a)
first
(b)
second
(c)
third
(d) fourth
Question 3
[4]
A 410 g non-elastic ball rolling at 5.2 m/s collides with a brick wall and comes to a standstill
in41 ms. Calculate the force required.
(a)
126.829 N
(b)
0.874. N
(c)
52N
(d)
309.3396 N
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1.3 Page 3 |
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Question 4
[2]
Choose the correct expression for the First Law of Thermodynamics:
(a)
AU = AQ + AW
(b)
AQ = AU + AW
(c)
AW = AQ + AU
(d)
AQ- AU = AW
Question 5
[2]
Which of the following is NOT a vector quantity?
(a)
kinetic energy
(b)
pressure
(c)
acceleration
(d)
momentum
Question 6
[2]
Four objects are standing on a flat surface in Figure 1. M indicates the centre of mass.
Which object will fall over?
Figure 1
(a)
(b)
(c)
(d)
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1.4 Page 4 |
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Question 7
[4]
Figure 3 shows the velocity-time graph for a moving object. Determine the total distance
moved fromt=4stot=13s.
v, (m/s)
20 rere
10
{)
—10
(a)
12m
(b)
99m
(c)
87m
(d)
111m
Figure 2
Question 8
[4]
A large heavy steel ball is dropped from a height of 75 m. At the same time when the ball is
released the timer starts. How far does the ball from t =0.5s tot = 2.7 s?
(a)
34.5312 m
(b)
75m
(c)
35m
(d)
23.7402 m
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1.5 Page 5 |
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Question 9
[4]
Determine the phase difference in degrees between the two waves in Figure 3.
0D.4 O\\
a L\\ 0.2
-nO8
\\
T\\ SVIZ
[/Z
IN VWmWFE
wes Gl
0.00
0.05
irrtlnceltiindania neal
0.10
0.15
gail ants
0.20
incaai
0.25
Time (ms)
(a)
23°
(b)
43°
(c)
63°
(d)
83°
Figure3
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SECTION B — TOTAL MARKS 70
This section consists of six (6) questions. Answer ALL the questions.
Question 10
[10]
Answer the questions 10.1 — 10.4 with regards to Figure 4.
Displacement-Time Graph
12
10
Time (s)
Figure 4
10.1
When is the object stationary?
(1)
10.2
When is the object accelerating?
(1)
10.3
Describe the movement from t = 0s to t = 6 seconds.
(3)
10.4
Determine total distance.
(2.5)
10.5
Determine total displacement.
(2.5)
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Question 11
[10]
The 17 m long flagpole with a mass of 35 kg, as shown in Figure 5, has a non-uniform shape.
It is attached to a 10 m vertical pole on the wider side of the flagpole. The centre of mass of
the flagpole is a third of the length of the flagpole from the left side. A flag with a mass of
14 kg hangs vertical from the right end. A strong steel cable is attached at the centre of the
flagpole at an angle of 46° to the horizontal.
cable
46°
14 kg
Figure 5
11.1
Determine the tension, T, in the cable for the flagpole to be in horizontal
equilibrium.
(6)
11.2
If the flag is moved to 10 m from the left end, what will the tension in the cable be? (4)
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1.8 Page 8 |
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Question 12
[12]
Two projectiles are launched at the same time at different angles and different initial
velocities. The reach the same maximum height. Projectile A is released at an angle of
34° to the horizontal with an initial velocity of 35 m/s.
d2el
Projectile B is launched at an initial velocity of 45 m/s. Determine the angle with
the horizontal at which projectile B is launched.
(3)
12.2
Determine the difference in range when the two projectiles strike the ground.
(6)
12.3
How high is projectile A after 3 seconds?
(3)
Question 13
[10]
A train carrying passengers to a ski resort in the Alps has a total mass of 55.60 t. The train
maintains a constant speed of 28 km/h. The track is horizontal for 42 km and then has a
steep incline towards the resort for another 5 km. The speed for the last 5 km is constant at
3 km/h.
13.1
Determine the work done over the first half of the journey.
(2)
13.2
The work done over the last 5 km of the journey is 2 392. 333 MJ with the train
experiencing a frictional force of 4 N/kg. Determine the angle of the incline.
(5)
13.3
How long will the journey take?
(3)
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Question 14
[8]
14.1
Give one word for: “Turning effect of a force.”
(1)
14.2 The lever in Figure 6 of length 25 m, is in a horizontal equilibrium. The centre of
gravity is in the middle of the lever. Determine the angle B.
(7)
7N
700
4846 N
3<m >
<t
12m
A
3m
>
Figure 6
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1.10 Page 10 |
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Question 15
[12]
15.4
Describe latent heat of a substances.
(2)
15.2 The graph in Figure 7 compares the energy in a substance as the temperature
decreases. This graph is for an unknown substance of mass 40 g with a boiling
point of 150°C. Heat is given out at a constant rate of 15 W.
Cooling Curve for a Substance
Time (min)
Figure 7
15.2.1 How much heat was released during condensation?
(1)
Lee Determine the latent heat of vaporization.
(2)
15.2.3 Determine the specific heat capacityjiquia of the substance.
(2)
15.2.4 How long will it take cool down 2 kg of the substance that has just condensed, to
freezing point?
(3)
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2.1 Page 11 |
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Question 16
[8]
Answer all the questions with reference to Figure 8.
The object makes just ONE oscillation according to the sequence: A- B—A-C-—A.
Equilibrium
position A
|
position B
DITTTITT
TIT
I AT
||
|
LAE
]
OOS EE ETS
x
position C
x
Figure 8
16.1
What is the direction of the restoring force at C?
(1)
16.2
At which position(s) will the object have maximum potential energy?
(1)
16.3
What sign will the velocity have at point A and B, while in movement from Ato B? (1)
16.4
Draw a graph showing how the kinetic energy varies for one oscillation.
(5)
The End
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2.2 Page 12 |
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Constants and formulas:
average speed = —di—s—ta—nc.e
time
average velocit‘ y = u +V
s=ut+ —2]at” 2
F=ma
work = Fs
E, =mgh
— autput x 100%
input
power =F x velocity
F
_
Amomentum
At
_ Ap
At
AU = AQ + Awork
E=mL
IPV, _ PoV>
10? | kilo |K | 10% | centi |c
10° | Mega | M |} 10% | milli | m
10° | Giga |G | 10° | micro] p
10% | Tera | T | 10° | nano | n
104 | Peta | P | 107%7/ pico |p
g = 9,81 m/s?
0 K =-273,15 °C
average velocit. y = displaia cmeement
moment = Fs
P ressure = BA
E.= d2 ng
power = work
m,u, +m,u, =m,v, +m,v,
fas d
Tt
E/Q = mcAT
pV =nRT
work = pAs = pAV
R = 8,31 J/molK