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A
ball
of
mass
m
is swung at the end of the rope in a
horizontal circle
.
Its
speed
v
is constant and the length of
the rope is
L
.
What
work
W
is done by the tension
T
in the rope
when
the mass moves a small distance
s
along the circle?
L
s
v
W
= ?
A.
mg s
B.
T s
C.
T L
D.
0
10 kg
F
pull
=10 N
10
°
10 m
A
10 kg
crate is pulled
10 m
along a frictionless horizontal
floor by a
force
F
pull
=10 N
applied at an
angle of 10
°
with
respect to the horizontal, as shown. What is the
net work
done on the crate by all the forces
that act on it?
W
net
= ?
A.
100 cos 10
°
J
B.
100 sin 10
°
J
C.
1000 J+ 100 sin 10
°
J
D.
1000 J+ 100 sin 10
°
J
A car of mass
m
traveling at a speed
v
is braked to a
stop by a constant force
F
.
What is the stopping distance
d
of the car?
(Use energy/work concepts to solve, not NII.)
d = ?
A.
F/v
B.
mv/F
C.
mv
2
/2F
D.
mv
2
/F
E.
2F/mv
2
A car of mass
m
traveling at a speed
v
is braked to a
stop by a constant force
F
.
If the initial
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This note was uploaded on 12/18/2011 for the course PHYS 2207 at Cornell University (Engineering School).
 '07
 LIEPE, M
 Physics, Energy, Mass, Work

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