### Quiz 2014.10.03

```Suppose you are on a cart initially at rest that rides on a
frictionless track. If you throw a ball off the cart towards the left,
will the cart be put into motion?
0%
ac
e.
th
e
pl
le
gh
t.
ri
ai
n
,t
o
N
o,
i
tw
ill
re
m
Ye
s
th
e
,t
o
Ye
s
0%
ft
.
0%
in
A. Yes, to the right.
B. Yes, to the left.
C. No, it will remain in place.
Suppose you are on a cart that is moving at a constant speed v to
the left on a frictionless track. If you throw a massive ball straight
up (from your perspective), how will the speed of the cart
change?
A.
kn
ow
th
e
ne
ed
to
of
sp
ee
d
e
Th
ho
w
tw
ca
r
tw
ca
r
th
e
of
sp
ee
d
e
Th
0%
fa
..
...
ill
ill
tw
ca
r
th
e
of
sp
ee
d
e
Th
0%
il.
..
0%
...
0%
Yo
u
The speed of the cart will
increase.
B. The speed of the cart will
decrease.
C. The speed of the cart will not
change.
D. You need to know how fast
the ball was thrown.
What is the total momentum of the system that includes spheres 1 and 2 only?
0%
ab
o
ve
ft
le
N
on
e
of
th
e
to
/s
m
kg
4
0%
th
e
r ig
ht
e
to
/s
m
kg
0%
th
e
r ig
ht
ft
le
e
30
28
kg
m
/s
to
to
/s
m
kg
16
0%
th
e
th
to
/s
m
kg
0%
th
le
th
e
to
/s
m
12
0%
r ig
ht
ft
0%
kg
5 kg m/s to the left
12 kg m/s to the right
16 kg m/s to the left
28 kg m/s to the right
30 kg m/s to the right
4 kg m/s to the left
None of the above
5
A.
B.
C.
D.
E.
F.
G.
What is the total momentum of the system that includes spheres 2 and 3 only?
of
ve
th
e
th
on
e
N
m
kg
21
0%
ab
o
e
r ig
ht
to
/s
to
/s
m
0%
r ig
ht
0%
th
e
r ig
ht
ft
le
kg
3
9
kg
m
/s
to
to
/s
m
kg
9
0%
th
e
e
th
to
/s
m
kg
0%
th
e
le
e
th
to
/s
m
12
0%
r ig
ht
ft
0%
kg
12 kg m/s to the left
12 kg m/s to the right
9 kg m/s to the left
9 kg m/s to the right
3 kg m/s to the right
21 kg m/s to the right
None of the above
12
A.
B.
C.
D.
E.
F.
G.
What is the total momentum of the system that includes all 3 spheres?
0%
ab
o
ve
ft
le
of
th
e
to
on
e
N
m
kg
5
0%
th
e
r ig
ht
/s
to
m
kg
5
0%
th
e
e
/s
/s
m
kg
19
r ig
ht
ft
le
e
to
to
/s
m
kg
19
0%
th
e
th
to
/s
m
kg
0%
th
le
e
th
to
/s
m
13
0%
r ig
ht
ft
0%
kg
13 kg m/s to the left
13 kg m/s to the right
19 kg m/s to the left
19 kg m/s to the right
5 kg m/s to the right
5 kg m/s to the left
None of the above
13
A.
B.
C.
D.
E.
F.
G.
What is the magnitude of the total momentum of the system that includes
spheres 1 and 2 only?
0%
N
on
e
of
20
th
e
kg
ab
o
m
ve
/s
/s
0%
m
8.
5
kg
4.
0
0%
kg
m
/s
m
66
0%
/s
0%
kg
m
/s
0%
kg
28 kg m/s
66 kg m/s
4.0 kg m/s
8.5 kg m/s
20 kg m/s
None of the above
28
A.
B.
C.
D.
E.
F.
What is the magnitude of the total momentum of the system that includes all three spheres?
None of the above
0%
0%
0%
0%
0%
0%
Ab
ou
t3
7
kg
Ab
m
/s
ou
t1
9
kg
Ab
m
/s
ou
t3
1
kg
Ab
m
/s
ou
t2
6
kg
Ab
m
/s
ou
t1
6
kg
N
on
m
e
/s
of
th
e
ab
ov
e
A.
B.
C.
D.
E.
F.
```