# PH1100 Physics I Review: Unit 3: 2-D Kinematics

Mechanics

Nov 14, 2013 (4 years and 5 months ago)

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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.