Transcript Spring Practice Test1

Final Exam Study
Spring 2010
Time for questions - 36 minutes
Spring Practice Test
Final Exam Review - 1 minute
1. Compare positions A
and B – which is true?
A. A has more kinetic and
potential energy
B. B has more kinetic and
less potential energy
C. B has less kinetic
energy
D. B has less potential
energy
B
A
Final Exam Study - 2 minutes
2.
If a 25 kg kid
slides from A to B,
how much kinetic
energy will he
have?
A.
B.
C.
D.
1250 J
500 J
750 J
Not enough
information
A-5m
B – 3.0 m
C–1m
Final Exam Study - 2 minutes
3.
If a 25 kg kid
slides from A to B,
how fast will he
be going?
A.
B.
C.
D.
10 m/s
40 m/s
6.32 m/s
7.75 m/s
A-5m
B – 3.0 m
C–1m
Final Exam Study - 1 minutes
4.
How would the
speed of A compare
with the speed of B?
A.
B.
C.
D.
A
A
A
A
>
<
=
≥
r
A
B
B
B
B
T=1s
m
2r
B
m
T=1s
Final Exam Study - 1 minute
5.
How would the Fc
of A compare with
the Fc of B?
A.
B.
C.
D.
A
A
A
A
>
<
=
≥
r
A
B
B
B
B
T=1s
m
2r
B
m
T=1s
Final Exam Study - 2 minutes
6.
Anna Matapea has a 7 kg bowling ball with
a .7 m rope attached. She is spinning it
around in a horizontal circle at a rate of 1
revolution every 2 seconds. What is the
tension in the rope?
A.
B.
C.
D.
22 N
40 N
68.6 N
48.4 N
Final Exam Study - 1 minute
7. A 10 kg cannon ball is moving at a
velocity of 5 m/s. Its momentum is
A.
B.
C.
D.
50 J
50 kg·m/s
2 kg·m/s
0.5 kg·m/s
Final Exam Study - 1 minute
8. What can cause the momentum of an
object to change?
A.
B.
C.
D.
changing velocity
external force acting on it
changing mass
all of the above
Final Exam Study - 1 minute
9. Two objects have the same mass.
One object is moving, the other is at
rest. If they collide, the resultant
velocity is
A.
B.
C.
D.
twice as much
the same
zero
one half as much
Final Exam Study - 2 minutes
10. A 125 kg lineman moving to the east at 7
m/s collides with a 100 kg quarterback
moving west at 8 m/s. Which of the
following is correct?
A. The total momentum both before and after the
collision is zero.
B. The total momentum before the collision is 1675
kg·m/s and zero kg·m/s after the collision.
C. The total momentum both before and after the
collision is 75 kg·m/s to the east.
D. None of the above are correct.
Final Exam Study - 2 minutes
11. A 65 g handball is hit toward the wall
with a speed of 25 m/s. It bounces back
with a speed of 20 m/s. What is the
magnitude of the change in momentum of
the ball?
A.
B.
C.
D.
.325 kg·m/s
2.93 kg·m/s
-2.93 kg·m/s
2930 kg·m/s
NOTE: Write down your numeric answer –
you’ll need it for the next question
Final Exam Study - 2 minutes
12. In the previous question, the ball is
in contact with the wall for 4 x 10-2 s.
What is the magnitude of the
average force exerted by the wall on
the ball during the collision?
A.
B.
C.
D.
8.13 N
73250 N
.134 N
73.3 N
Final Exam Study - 1 minute
13. Identify the point of minimum
amplitude (node) of this standing
wave:
Final Exam Study - 1 minute
14. A wave in the lake is observed to
have a frequency of .12 Hz and a
speed of .75 m/s. What is its
wavelength?
A.
B.
C.
D.
6.25 m
0.16 m
.09 m
625 m
Final Exam Study - 2 minutes
15.What is the wavelength of light with
a frequency of 6.2 x 1013 Hz? The
speed of light is 3.0 x 108 m/s.
A.
B.
C.
D.
4.84
2.07
4.84
4.84
nm
x 106 m
μm
m
Final Exam Study - 1 minute
16.The equation below is also known as
F k
q1q 2
d2
A.Ohm’s Law
B.Newton’s Third Law
C.Pascal’s Law
D.Coulomb’s Law
Final Exam Study - 2 minutes
17.If there are two electrons located
2mm from one proton, what is the
force between them?
A.
B.
C.
D.
5.76
1.15
1.15
1.15
x
x
x
x
10-23
10-28
10-22
10-22
N,
N,
N,
N,
repulsive
attractive
attractive
repulsive
Final Exam Study - 1 minute
18. Two electrically charged points
have a force of 6 N between them. If
the distance between them is tripled,
what will the force be?
A.
B.
C.
D.
.67 N
54 N
18 N
2N
Final Exam Study - 1 minute
19.Voltage in an electrical circuit is also
called
A.
B.
C.
D.
kinetic energy
electric potential
resistance
amperage
Final Exam Study - 2 minutes
20. The telephone company uses 48v
to power “land line” telephones. If
the resistance of the telephone lines
is 1200 Ω, how much current will
flow while you’re talking?
A.
B.
C.
D.
0.04 A
57600 A
25 A
25 V
Final Exam Study
Use the circuit below to answer questions
21 - 24. (Sketch it on your paper).
I50 = .057 A
Final Exam Study - 2 minutes
21. What is the equivalent resistance
for the circuit?
A.
B.
C.
D.
87.1 Ω
140 Ω
7.8 Ω
70.1 Ω
Final Exam Study - 1 minute
22. What is the total current flow in the
circuit?
A.
B.
C.
D.
.036 A
.057 A
.64 A
.071 A
Final Exam Study - 1 minute
23. What is the voltage drop across the
20 Ω resistor?
A.
B.
C.
D.
.0029 V
.72 V
12.8 V
1.14 V
Final Exam Study - 1 minute
24. What is the voltage drop across the
30 Ω resistor?
A.
B.
C.
D.
.977 V
1.71 V
5V
1.22 V
Final Exam Study - 1 minute
25. When the whole universe is
considered, every process results in
increased
A.
B.
C.
D.
order
enthalpy
disorder
acuity
Final Exam Study
Answer Key
1–C
7–B
13 – C 19 – B
2–B
8–D
14 – A 20 – A
3–C
9–D
15 – C 21 – A
4–B
10 – C 16 – D 22 – B
5–B
11 – B 17 – C 23 – D
6 – D 12 – D 18 – A 24 – A
25 - C