lai (yl8859) – HW04 – Ross – (15200)
1
This
printout
should
have
8
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
(part 1 of 3) 10.0 points
A particle moves in the
xy
plane with constant
acceleration. At time zero, the particle is at
x
= 5
.
5 m,
y
= 8
.
5 m, and has velocity
vectorv
o
=
(1
.
5 m
/
s) ˆ
ı
+ (

9 m
/
s) ˆ
.
The acceleration is
given by
vectora
= (7 m
/
s
2
) ˆ
ı
+ (4
.
5 m
/
s
2
) ˆ
.
What is the
x
component of velocity after
5 s?
Answer in units of m
/
s.
002
(part 2 of 3) 10.0 points
What is the
y
component of velocity after 5 s?
Answer in units of m
/
s.
003
(part 3 of 3) 10.0 points
What is the magnitude of the displacement
from the origin (
x
= 0 m,
y
= 0 m) after 5 s?
Answer in units of m.
004
10.0 points
A plane drops a hamper of medical supplies
from a height of 3850 m during a practice run
over the ocean. The plane’s horizontal veloc
ity was 133 m
/
s at the instant the hamper
was dropped.
The acceleration of gravity is 9
.
8 m
/
s
2
.
What is the magnitude of the overall veloc
ity of the hamper at the instant it strikes the
surface of the ocean?
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 Winter '08
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 Physics, mechanics, Acceleration, m/s, 1.5 m/s, 5.5 m

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