### Quiz 2014.09.05

```When moving with a constant speed in
a circular path, velocity is __________
Constant
Equal to speed
Always changing
None of the above.
0%
ve
.
of
on
e
N
Al
w
ay
s
th
e
ch
an
ab
o
gi
n
sp
ee
d
o
lt
Eq
ua
0%
g
0%
st
an
t
0%
Co
n
A.
B.
C.
D.
You and your BFF throw rocks with different
initial speeds. The rocks follow parabolic
trajectories with the same maximum height.
Whose rock hits the ground first if your BFF’s
rock hits the ground 10 meters past yours?
0%
e
m
m
e
hi
t
no
ot
e
N
at
th
e
sa
Yo
u
ey
Th
ug
h
ti
rB
rs
0%
in
fo
!
0%
FF
’s
0%
Yo
u
A. Yours
C. They hit at the same
time
D. Not enough info!
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
has the greatest initial
speed?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
has the smallest speed
immediately before it
impacts the ground?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
has the greatest initial
horizontal component of
velocity?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
has the greatest speed at
the top point of flight?
25%
25%
l
al
fo
r
e
Sa
m
25%
C
25%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
reaches the greatest height?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C
are launched as shown. The
arrows represent initial
velocities. Which projectile
spends the longest time in
the air?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
Three projectiles A, B, and C are
launched as shown. The arrows
represent initial velocities.
Assuming all projectiles are still
in the air after three seconds,
which one has the greatest
horizontal displacement at that
moment?
0%
0%
l
al
fo
r
e
Sa
m
0%
C
0%
B
A
B
C
Same for all
A
A.
B.
C.
D.
```