Clicker Question
Clicker Question
A DVD is rotating with an everincreasing speed. How do the
centripetal acceleration arad and
tangential acceleration atan
compare at points P and Q?
A. P and Q have the same arad
and atan.
B. Q has a greater arad and a
greater atan than P.
C. Q has a smaller arad and a greater atan than P.
D. P and Q have the same arad, but Q has a greater atan than P.
Clicker Question
A DVD is rotating with an everincreasing speed. How do the
centripetal acceleration arad and
tangential acceleration atan
compare at points P and Q?
A. P and Q have the same arad
and atan.
B. Q has a greater arad and a
greater atan than P.
C. Q has a smaller arad and a greater atan than P.
D. P and Q have the same arad, but Q has a greater atan than P.
Clicker Question
Compared to a gear tooth on
the rear sprocket (on the left,
of small radius) of a bicycle, a
gear tooth on the front
sprocket (on the right, of large
radius) has
A. a faster linear speed and a faster angular speed.
B. the same linear speed and a faster angular speed.
C. a slower linear speed and the same angular speed.
D. the same linear speed and a slower angular speed.
E. none of the above
Clicker Question
Compared to a gear tooth on
the rear sprocket (on the left,
of small radius) of a bicycle, a
gear tooth on the front
sprocket (on the right, of large
radius) has
A. a faster linear speed and a faster angular speed.
B. the same linear speed and a faster angular speed.
C. a slower linear speed and the same angular speed.
D. the same linear speed and a slower angular speed.
E. none of the above
Table 9.2
The three objects
shown here all have
the same mass M
and radius R. Each
object is rotating
about its axis of
symmetry (shown in
blue). All three
objects have the
same rotational
kinetic energy.
Which one is
rotating fastest?
A. hollow cylinder
B. solid cylinder
C. thin-walled hollow cylinder
D. two or more of these are tied
for fastest
Q9.7
A thin, very light wire is wrapped
around a drum that is free to rotate.
The free end of the wire is attached
to a ball of mass m. The drum has the
same mass m. Its radius is R and its
moment of inertia is I = (1/2)mR2. As
the ball falls, the drum spins.
At an instant that the ball has
translational kinetic energy K, the
drum has rotational kinetic energy
A. K.!
these
!
B. 2K.! !
C. K/2.!!
D. none of
Clicker Question
A thin, very light wire is wrapped
around a drum that is free to
rotate. The free end of the wire is
attached to a ball of mass m. The
drum has the same mass m. Its
radius is R and its moment of inertia
is I = (1/2)mR2. As the ball falls, the
drum spins.
At an instant that the ball has
translational kinetic energy K, the
drum has rotational kinetic energy
A. K.!
!
B. 2K.! !
C. K/2.!!
D. none of these
When the masses fall through the same height h,
which pulley will be rotating faster? (r1=r2, m1=m2)
A] solid pulley
B] hollow pulley
C] both the same
Clicker Question
Which of the four forces shown
here produces a torque about O
that is directed out of the plane of
the drawing?
F1
A. F1
B. F2
C. F3
D. F4
E. more than one of these
F3
O
F2
F4
Clicker Question
Which of the four forces shown
here produces a torque about O
that is directed out of the plane of
the drawing?
F1
A. F1
B. F2
C. F3
D. F4
E. more than one of these
F3
O
F2
F4
The four forces shown all have the
same magnitude: F1 = F2 = F3 = F4.
Which force produces the greatest
torque about the point O (marked
by the blue dot)?
F1
F3
O
F2
F4
A. F1
B. F2
C. F3
D. F4
E. not enough information given to decide
The four forces shown all have the
same magnitude: F1 = F2 = F3 = F4.
Which force produces the greatest
torque about the point O (marked
by the blue dot)?
F1
F3
O
F2
F4
A. F1
B. F2
C. F3
D. F4
E. not enough information given to decide
Clicker Question
Ball A, of mass 3.0 kg, is attached to a 0.4-m light rod, freely pivoted at
P. Ball B is suspended from Q by a 0.6-m rope and is at rest.
Ball A descends, and has a speed v1 = 3.6
m/s at the bottom, prior to striking ball
B. The speed of balls A and B after the
collision are v2 = 1.1 m/s and v3 = 2.3
m/s, as shown. In Fig. 8.6, the mass of ball
B is closest to:
A. 5.4 kg
B. 3.8 kg
C. 6.1 kg
D. 4.6 kg
E. 3.1 kg
Clicker Question
Ball A, of mass 3.0 kg, is attached to a 0.4-m light rod, freely pivoted at
P. Ball B is suspended from Q by a 0.6-m rope and is at rest.
Ball A descends, and has a speed v1 = 3.6
m/s at the bottom, prior to striking ball
B. The speed of balls A and B after the
collision are v2 = 1.1 m/s and v3 = 2.3
m/s, as shown. In Fig. 8.6, the mass of ball
B is closest to:
A. 5.4 kg
B. 3.8 kg
C. 6.1 kg
D. 4.6 kg
E. 3.1 kg