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FOSEE , MULTIMEDIA UNIVERSITY
(436821T)
MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA.
Tel 606 252 3594 Fax 606 231 8799
URL: http://fosee.mmu.edu.my/~asd/
PPH 0075
Physics I
Foundation in Engineering
Assignment 1
APPLIED SCIENCE DEPARTMENT
(ASD)
Centre for Foundation Studies and Extension Education
(FOSEE)
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Chapter 1:
Question 1:
a) The time
T
required for one complete oscillation of a mass,
m
on a spring, having spring
constant,
k,
is
k
m
T
π
2
=
. Find the dimensions that
k
must have, in order for this equation to
be dimensionally correct.
[2 marks]
b) Two vectors are given as
k
j
i
A
ˆ
4
ˆ
3
ˆ
2
+
+
=
ρ
and
ˆ
ˆ
ˆ
5
2
B
i
j
k
=  +

r
. Find the angle,
between
these vectors.
[3 marks]
c) The volume of liquid flowing through a thin tube per unit time, denoted by
Q
, can be expressed
in terms of radius
R
of the tube, the viscosity
η
of the liquid, the pressure drop
P
in the tube,
and length
L
of the tube in the form
r
s
q
P
Q
k
R
L
±
=
²
³
´
µ
where
k
,
s
,
q
and
r
are dimensionless constants. If the S.I units for viscosity
is
Ns/m²
, what
must be the values of
p
,
q
and
r
?
[3 marks]
d) Given
( )
sin
E
al
bt
=
, where
E
is energy,
l
is length and
t
is time
i)
What are the dimensions and SI units of
b
?
[1 mark]
ii) What are the dimensions and SI units of
a
?
[1 mark]
s
Question 2:
a) A typical virus is a packet of protein and
DNA
(or
RNA
) and can be spherical in shape. The
influenza A virus is a spherical virus that has a diameter of
85 nm
. If the volume of saliva
coughed onto you by your friend with the flu is
0.010 cm
3
and
9
10
1
of that volume consists of
viral particles, how many influenza viruses have landed on you? [3 marks]
b) The radius of a circle is measured to be (
20.5
±
0.2
)
m
. Calculate the
i)
area and
ii) circumference
of the circle, and give the uncertainty in each value.
[4 marks]
c) A cat runs
100.0
meters in a direction of
60.0
25.0
meters
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This note was uploaded on 10/30/2010 for the course FOSEE CVL1040 taught by Professor None during the Spring '09 term at Multimedia University, Cyberjaya.
 Spring '09
 none

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