P a g e

1
PH
1
1
00
–
Physics
I
Review
:
Unit 3
:
2

D Kinematics
1
. Add the following sets of vectors by the graphical (head to tail) method.
a)
⃑
[
]
,
⃑
⃑
[
]
b)
⃑
[
]
,
⃑
⃑
[
]
,
⃑
[
]
2
. Add the following sets of vectors by
using the Law of Sines and the Law of Cosines
.
a)
⃑
[
]
,
⃑
⃑
[
]
b)
⃑
[
]
,
⃑
⃑
[
]
3. Add the following sets of vectors by the graphical (head to tail) method.
a)
⃑
[
]
,
⃑
⃑
[
]
,
⃑
⃑
[
]
b)
⃑
[
]
,
⃑
⃑
[
]
,
⃑
[
]
4. Two cars approach an intersection where the lights are malfunctioning, and since both cars get a
green light, they both enter the intersection at full speed. The first car is traveling south towards the
intersectio
n at a rate of 26 m/s, and the second is traveling west at a rate of 20 m/s. If you’re a
passenger in the first car, with what velocity does it appear that the second car is approaching you with?
5. A 747 travels at 150 m/s [60
°
N of E] between Tampa and
St. John’s. It encounters a crosswind of 22
m/s [10
°
S of E]. What velocity does an observer on the ground see?
6.
A trained dolphin leaps from the water with an initial speed of 12.0 m/s. It jumps directly toward a
ball held by the trainer, whose platfor
m is a horizontal distance of 5.50 m away. The ball is held at a
height of 4.10 m. Show that if the dolphin jumps from the water as described at the same instant the
trainer releases the ball, the ball and the dolphin meet.
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