homework 07 – FONTENOT, BRIAN – Due: Mar 3 2008, 4:00 am
1
Question 1, chap 8, sect 1.
part 1 of 3
10 points
A 3 kg block collides with a massless spring
of spring constant 94 N
/
m attached to a wall.
The speed of the block was observed to be
1
.
3 m
/
s at the moment of collision.
The acceleration of gravity is 9
.
8 m
/
s
2
.
How far does the spring compress if the sur
face on which the mass moves is frictionless?
Answer in units of cm.
Question 2, chap 8, sect 1.
part 2 of 3
10 points
The maximum distance to which the
spring was compressed was observed to be
13
.
9345 cm.
What is the kinetic coe±cient of friction
between the block and the ²oor?
Question 3, chap 8, sect 1.
part 3 of 3
10 points
Given:
The coe±cient of static friction be
tween the ²oor and the block is 0
.
594033.
Does the block remain at rest or does it
bounce back o³ the spring once the spring is
fully compressed?
1.
cannot be determined
2.
bounces back
3.
stays at rest
Question 4, chap 8, sect 2.
part 1 of 2
10 points
A bead slides without friction around a
looptheloop. The bead is released from a
height
h
from the bottom of the looptheloop
which has a radius
r
.
h
r
Which of the following diagrams best rep
resents the kinetic energy of the bead versus
time?
1.
t
K
2.
t
K
3.
t
K
4.
t
K
5.
t
K
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2
6.
t
K
Question 5, chap 8, sect 2.
part 2 of 2
10 points
Which of the following could represent the
gravitational potential energy of the bead ver
sus time?
1.
t
U
2.
t
U
3.
t
U
4.
t
U
5.
t
U
6.
t
U
Question 6, chap 8, sect 2.
part 1 of 1
10 points
Use the potential energy
vs
. position plot
shown below to answer the following question.
A particle is released from point
A
and
moves in the potential
U
(
x
).
Suppose the
mechanical energy of the system is conserved.
x
U
(
x
)
V
T
Y
A
At which position(s) will the kinetic energy
of the particle have its maximum value?
1.
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 Spring '08
 Turner
 Physics, Force, Friction, Mass, Potential Energy, Work

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