Homework 3 hints
2/123.
v
is a constant. Use particle kinematics equation to calculate a:
a
=
±
s
22
0
2
vv
a
=+Δ
.
2/130
In order to calculate
B
ρ
, you have to calculate
B
v
and
.
n
a
Step 1.
calculate
a
(const.) due to strong
0
x
≠
wind. The key point here is to find special
point on this projectile. C is this point!!!!!
In rectangular coordinates:
120'
c
x
=
and
2
00
1
2
cx
c
x
c
x
xv
t
a
t
=+
+
Similar you can derive the second equation
In y direction:
0
c
y
=
Solve the above two equations, you will get
3.05
c
t
=
sec and
ft/sec
7.0
x
a
=
2
.
Step2.
Find the velocity at B.
Important:
notice the angle is
45
D
x
y
⇒=
. From
kinematics of particle, you have two equations in terms of
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 Spring '05
 staff
 Cartesian Coordinate System, Acceleration, Elementary algebra, Right angle

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