The following vectors are added:
A=(2,4) and B=(4,2)
(this notation simply gives the (x,y) components
of the vector)
What angle does the resultant make with the xaxis?
1. 0°
A + By 2 + 4
tan(θ ) = y
=
=1
2. 30°
A
B
+
4
+
2
x
x
3. 45°
4. -30°
5. -45°
Assume that both snowballs are thrown with a speed of
25.0 m/s. The first is thrown at an angle of 70.0° with
respect to the horizontal. (a) At what angle should the
second snowball be thrown to arrive at the same point as
the first?
A. 10.0°
1m
The red ball and blue ball are both at
height 1 m above ground. The red ball
is released from rest. The blue ball has
initial velocity in the horizontal direction
of 1 m/s. Which ball hits the ground
first?
„
A. red first
C. 30.0°
D. 40.0°
E. 50.0°
B. blue first
C. same time
In-class Quiz #5-4 – Rescue!
How much time will it
take for the parcel to
drop from the plane to
the ground?
A. 2 s
B. 5 s
C. 10 s
D. 12 s
E. 20 s
B. 20.0°
Vx = 1 m/s
V = 0 m/s
In-class Quiz #5-1 –Find the Angle
30 m/s
125 m
0
1
∆y = v y 0t + a y t 2
2
0-125m = ½ (-9.8m/s2) t2
In-class Quiz #5-5 – Rescue!
How far before the
plane gets to the
hikers does the
rescuer need to
drop the parcel?
A. 180 m
B. 150 m
C. 120 m
D. 100 m
E. 50 m
30 m/s
125 m
∆x = vx0t
= (30 m/s ) (5 s)
1