kuehner (rjk679) – CW13 – Mackie – (20211)
1
This printout should have 5 questions.
Multiplechoice questions may continue on
the next column or page – fnd all choices
beFore answering.
001
10.0 points
A roller coaster cart oF mass
m
= 333 kg starts
stationary at point A, where
h
1
= 30
.
8 m and
a while later is at
B
, where
h
2
= 11
.
6 m.
The acceleration oF gravity is 9
.
8 m
/
s
2
.
h
h
A
B
1
2
What is the speed oF the cart at
B
, ignoring
the e±ect oF Friction?
Correct answer: 19
.
399 m
/
s.
Explanation:
By conservation oF energy
Δ
U
+ Δ
K
= 0
(
mg h
2

1
) +
1
2
mv
2
= 0
mg
(
h
1

h
2
) =
1
2
2
Solving For
v
,
v
=
r
2
g
(
h
1

h
2
)
=
R
2 (9
.
8 m
/
s
2
) (30
.
8 m

11
.
6 m)
= 19
.
399 m
/
s
002
(part 1 oF 3) 10.0 points
A block starts at rest and slides down a Fric
tionless track except For a small rough area on
a horizontal section oF the track (as shown in
the fgure below).
It leaves the track horizontally, ²ies through
the air, and subsequently strikes the ground.
The acceleration oF gravity is 9
.
8 m
/
s
2
.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '09
 MIHALISIN
 Physics, Acceleration, Mass, Trigraph, m/s, Coordinate system, World War I submarines of the United Kingdom

Click to edit the document details