homework 06 – GADHIA, TEJAS – Due: Feb 28 2007, 4:00 am
1
Question 1
part 1 of 2
10 points
While skiing in Jackson, Wyoming, your
friend Ben (75 kg) started his descent down
the bunny run, 11 m above the bottom of the
run.
If he started at rest and converted all of
his gravitational potential energy into kinetic
energy, what is Ben’s kinetic energy at the
bottom of the bunny run?
Answer in units of J.
Question 2
part 2 of 2
10 points
What is his final velocity?
Answer in units of m
/
s.
Question 3
part 1 of 3
10 points
A block starts at rest and slides down a
frictionless track except for a small rough area
on a horizontal section of the track (as shown
in the figure below).
It leaves the track horizontally, flies through
the air, and subsequently strikes the ground.
The acceleration of gravity is 9
.
81 m
/
s
2
.
μ
=0
.
3
1
.
1 m
525 g
h
1
.
9 m
4
.
06 m
9
.
81 m
/
s
2
v
At what height
h
above the ground is the
block released?
Answer in units of m.
Question 4
part 2 of 3
10 points
What is the the speed of the block when it
leaves the track?
Answer in units of m
/
s.
Question 5
part 3 of 3
10 points
What is the total speed of the block when
it hits the ground?
Answer in units of m
/
s.
Question 6
part 1 of 1
10 points
Two atoms of equal mass interact with a
potential energy
U
(
r
) =
A
r
8

B
r
4
A >
0
, B >
0
At what separation is the force zero?
1.
4
radicalbigg
B
2
A
2.
4
radicalbigg
A
B
3.
4
radicalbigg
B
A
4.
4
radicalbigg
2
A
B
Question 7
part 1 of 3
10 points
Starting from rest, a(n)8 kg block slides
12
.
3 m down a frictionless ramp (inclined at
30
◦
from the floor) to the bottom. The block
then slides an additional 23
.
3 m along the
floor before coming to stop.
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 Spring '10
 Clerck
 Force, Mass, Potential Energy

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