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PHY 317K
August 30, 2007
HOMEWORK # 1
DUE on September 12, 2007 by 8:00pm
Instructions:
Use a UT ANSWER SHEET to mark answers. Provide your
NAME
(last, first),
UTEID
, and
UNIQUE NUMBER
of the course. Sign and date it. The answer sheets must be
placed in the
317K box
located by the bulletin board outside PAI 2.48.
Late homework will not be graded
.
Answer the following 50 questions:
1. A nanosecond is:
A) 10
9
s
B) 10
–9
s
C) 10
–10
s
D) 10
–10
s
E) 10
–12
2. Which of the following weighs about a pound?
A) 0.05 kg
B) 0.5 kg
C) 5 kg
D) 50 kg
E) 500 kg
3. The number of significant figures in 15.0 is:
A) 1
B) 2
C) 3
D) 4
E) 5
4. 1.513 + 27.3 =
A) 29
B) 28.8
C) 28.9
D) 28.81
E) 28.813
Page 1
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View Full Document 5. A sphere with a radius of 1.7 cm has a surface area of:
A) 2.1
×
10
–5
m
2
B) 9.1
×
10
–4
m
2
C) 3.6
×
10
–3
m
2
D) 0.11 m
2
E) 36 m
2
6. 1 m is equivalent to 3.281 ft. A cube with an edge of 1.5 ft has a volume of:
A) 1.2
×
10
2
m
3
B) 9.6
×
10
–2
m
3
C) 10.5 m
3
D) 9.5
×
10
–2
m
3
E) 0.21 m
3
7. During a short interval of time the speed
v
in m/s of an automobile is given by
v
=
at
2
+
bt
3
, where the time
t
is in seconds. The units of
a
and
b
are respectively:
A) m
⋅
s
2
; m
⋅
s
4
B) s
3
/m; s
4
/m
C) m/s
2
; m/s
3
D) m/s
3
; m/s
4
E) m/s
4
; m/s
5
8. Suppose
A
=
BC
, where
A
has the dimensions L/M and
C
has the dimensions L/T. Then
B
has the dimension:
A) T/M
B) L
2
/TM
C) TM/L
2
D) L
2
T/M
E) M/L
2
T
9. Suppose
A
=
B
n
C
m
, where
A
has dimensions LT,
B
has dimensions L
2
T
–1
, and
C
has
dimensions LT
2
. Then the exponents
n
and
m
have the values:
A) 2/3; 1/3
B) 2; 3
C) 4/5; –1/5
D) 1/5; 3/5
E) 1/2; 1/2
Page 2
A) the daily rotation of the Earth
B) the frequency of light emitted by Kr
86
C) the yearly revolution of the Earth about the sun
D) a precision pendulum clock
E) none of these
11. A particle moves along the
x
axis from
x
i
to
x
f
.
Of the following values of the initial
and final coordinates, which results in a negative displacement?
A)
x
i
= 4m,
x
f
= 6m
B)
x
i
= –4m,
x
f
= –8m
C)
x
i
= –4m,
x
f
= 2m
D)
x
i
= –4m,
x
f
= –2m
E)
x
i
= –4m,
x
f
= 4m
12. A car travels 40 kilometers at an average speed of 80 km/h and then travels 40
kilometers at an average speed of 40 km/h. The average speed of the car for this 80 km
trip is:
A) 40 km/h
B) 45 km/h
C) 48 km/h
D) 53 km/h
E) 80 km/h
13. The coordinate of a particle in meters is given by
x
(
t
) = 16
t
– 3.0
t
3
, where the time
t
is in
seconds. The particle is momentarily at rest at
t
=
A) 0.75 s
B) 1.3 s
C) 5.3 s
D) 7.3 s
E) 9.3 s
14. A ball rolls up a slope. At the end of three seconds its velocity is 20 cm/s; at the end of
eight seconds its velocity is 0. What is the average acceleration from the third to the
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This note was uploaded on 03/20/2008 for the course PHY 317k taught by Professor Kopp during the Spring '07 term at University of Texas at Austin.
 Spring '07
 KOPP
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