HW10-solutions.pdf - moss am85383 HW10 de lozanne 55430 ...

moss (am85383) – HW10 – de lozanne – (55430) 1
This print-out should have 25 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
001(part1of2)10.0points
What is the total angular momentum of the
system about the z -axis relative to point B
along y axis if d
2
= 21 m?
002(part2of2)10.0points
003 10.0points
An airplane of mass 998 kg flies level to the
ground at a constant speed of 175 m / s relative
What is the total angular momentum of
the system about the z -axis relative to point
A along y axis if d
1
= 20 m?
to the Earth. An observer on the ground
along the path of the plane sees the plane a
distance 10125 . 8 m away at an angle above
the horizontal of 66 . 7
◦
.
What is the magnitude of the airplane’s
angular momentum relative to a ground ob-
server directly below the airplane?
004 10.0points

moss (am85383) – HW10 – de lozanne – (55430) 2
A sticky blob strikes and sticks to a free rod,
which is initially at rest, as shown.
Let E be the mechanical energy of the sys-
tem,
vector
P the linear momentum of the system,
and
vector
L the angular momentum of the system.
What is conserved?
1.
vector
L and E
2.
vector
P only
3.
vector
L only
4.
vector
L ,
vector
P , and E
5.
vector
P and E
6.
vector
L and
vector
P correct
005 10.0points
A light, rigid rod l = 5 . 48 m in length rotates
in the xy plane about a pivot through the
rod’s center. Two particles of masses m
1
=
8 . 4 kg and m
2
= 1 . 2 kg are connected to its
ends.
x
y
l
v
v
m
2
m
1
Determine the angular momentum of the
system about the origin at the instant the
speed of each particle is v = 1 . 87 m / s.