alexander (jra2623) – oldhomework 27 – Turner – (92510)
1
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printout
should
have
14
questions.
Multiplechoice questions may continue on
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before answering.
001
10.0 points
19 waves crash onto a beach every 49
.
9 s.
What is their frequency?
Correct answer: 0
.
380762 Hz.
Explanation:
Let :
n
= 19
,
and
t
= 49
.
9 s
.
Frequency is the number of cycles per unit
time, so
f
=
n
t
=
19
49
.
9 s
=
0
.
380762 Hz
.
keywords:
002
(part 1 of 2) 10.0 points
A block on a horizontal frictionless plane is
attached to a spring, as shown below.
The
block oscillates along the
x
axis with simple
harmonic motion of amplitude
A
.
m
k
0

A
+
A
v
x
0
Which statement about the block is cor
rect?
1.
At
x
=
A
, its velocity is at a maximum.
2.
At
x
= 0, its acceleration is at a maxi
mum.
3.
At
x
= 0, its velocity is zero.
4.
At
x
=
A
, its displacement is at a maxi
mum.
correct
5.
At
x
=
A
, its acceleration is zero.
Explanation:
The block oscillates from maximum dis
placements at
x
=
A
and
x
=

A
. At those
points the velocity is momentarily zero.
003
(part 2 of 2) 10.0 points
Which statement about energy is correct?
1.
The potential energy of the spring is at a
minimum at
x
= 0.
correct
2.
The kinetic energy of the block is always
equal to the potential energy of the spring.
3.
The kinetic energy of the block is at a
maximum at
x
=
A
.
4.
The potential energy of the spring is at a
minimum at
x
=
A
.
5.
The kinetic energy of the block is at a
minimum at
x
= 0.
Explanation:
From conservation of energy,
v
= 0 at
x
=
±
A,
so the kinetic energy is zero and the
spring potential energy is at its maximum. At
x
= 0, the spring potential energy is 0 and the
kinetic energy is at its maximum.
004
(part 1 of 3) 10.0 points
A block of mass 0
.
1 kg is attached to a
spring of spring constant 17 N
/
m on a fric
tionless track. The block moves in simple har
monic motion with amplitude 0
.
17 m. While
passing through the equilibrium point from
left to right, the block is struck by a bullet,
which stops inside the block.
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 Summer '08
 Kaplunovsky
 Energy, Kinetic Energy, Potential Energy, Simple Harmonic Motion, Work, Correct Answer

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