gaitons
Set 3, Due Tue, Feb 12, 2008 at 23:59
1.
1
. [1 point, 10 tries]
A sailboat is travelling east at 3.80 m/s. A sudden gust of wind gives the boat an acceleration
a
=(0.500 m/s
2
,32.0° north of east). What is the boat's speed 6.60 s later when the gust subsides?
Answer:
6.83e+00 m/s
2.
2
. [1 point, 10 tries]
What is the boats new direction? (Enter your answer as an angle corresponding to the direction North of
East. Do not input a unit.)
Answer:
1.48e+01
3.
3
. [1 point, 10 tries]
A physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown. The
ball's position is shown at 1.00 s intervals until
t
=3.00 s. At
t
=1.00 s, the ball's velocity is
v
=(2.75
i
+1.23
j
) m/s. Determine the ball's velocity at
t=
0.00 s. (Enter your answer in component form.
Input the
x
component
first, followed by the
y
component
.)
Answer:
2.75e+00 m/s 2.46e+00 m/s
4.
4
. [1 point, 10 tries]
Determine the ball's velocity at
t
=2.00 s. (Enter your answer in component form. Input the
x
component
first, followed by the
y
component
.)
Answer:
2.75e+00 m/s 0.0 m/s
5.
5
. [1 point, 10 tries]
Determine the ball's velocity at
t
=3.00 s. (Enter your answer in component form. Input the
x
component
first, followed by the
y
component
.)
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Answer:
2.75e+00 m/s 1.23e+00 m/s
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 Winter '08
 HUGHES
 mechanics, Acceleration, Velocity, Conveyor belt

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