Muraj, Hamza – Homework 6 – Due: Feb 3 2006, 4:00 am – Inst: Florin
1
This
printout
should
have
9
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
The due time is Central
time.
001
(part 1 of 1) 10 points
A bowling ball accidentally falls out of the
cargo bay of an airliner as it flies along in a
horizontal direction.
Z
Y
X
W
U
V
As observed by a person standing on the
ground and viewing the plane as in the fig
ure, which path would the bowling ball most
closely follow after leaving the airplane?
1.
X
2.
U
3.
Y
4.
Z
5.
V
6.
W
correct
Explanation:
The horizontal direction of ball motion is
due to initial velocity it got from the air
liner,
and
the
vertical
is
due
to
gravity.
The resultant motion is on a parabolic curve
dotted curve
W
(example of projectile mo
tion).
Note:
Dotted curves
Z
and
U
are arcs of
circles. Dotted line
X
is a straight line. Dot
ted curve
V
is a bezier curve.
Dotted curve
Y
is a parabolic curve with axes inverted.
002
(part 1 of 1) 10 points
A 0
.
57 kg rock is projected from the edge of
the top of a building with an initial velocity of
8
.
76 m
/
s at an angle 44
◦
above the horizontal.
Due to gravity, the rock strikes the ground at
a horizontal distance of 14
.
9 m from the base
of the building.
Assume:
The ground is level and that the
side of the building is vertical. The accelera
tion of gravity is 9
.
8 m
/
s
2
.
Building
14
.
9 m
44
◦
8
.
76 m
/
s
h
How tall,
h
, is the building?
Correct answer: 13
.
0076 m.
Explanation:
Basic Concepts:
v
x
=
v
x
0
= constant
v
y
=
v
y
0

g t
x
=
v
x
0
t
y
=
v
y
0
t

1
2
g t
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
 Turner
 Acceleration, Velocity, Cos, Correct Answer, Standard gravity, initial speed

Click to edit the document details