Worksheet 3: Mixed Review- Torque, MI and
Equilibrium
1.
A force of 17 N is applied to the end of
a line joining the pivot point to the handle. What
is the magnitude of the torque about the pivot
point produced by this force?
10.7 N ∙ m B) 9.7 N ∙ m C) 12.0 N ∙ m
D) 7.6 N ∙ m
2.
free to rotate about a
frictionless axis through
a 0.63-m long torque wrench at an angle 45° from
A)
5. Two wheels are fixed to each other and are
A boy and a girl are balanced on a massless
their concentric center.
As shown, four forces are
exerted tangent to the
wheels. The magnitude of
the net torque is:
(A) zero (B) FR (C) 2FR
(D) 4FR (E) 8FR
seesaw. The boy has a mass of 60 kg and the
4.
girl's mass is 50 kg. If the boy sits 1.5 m from
mass M is attached
the pivot point on one side of the seesaw, where
by
must the girl sit on the other side for equilibrium?
length
A)
ceiling, making an
1.8 m B) 1.3 m C) 2.5 m D) 3.0 m E) 1.2
m
An object of
a
string
L
to
of
the
angle of 30o with
The
figure
shows
a
person's foot. In that
figure,
the
Achilles
tendon exerts a force of
magnitude F = 720 N.
What is the magnitude
of the torque that this
force produces about the
respect
to
the
vertical axis. The
object moves in a horizontal circle, so that the
string sweeps out a cone. What is the moment of
inertia of the mass with respect to the vertical
axis?
(a)
ML^2 /4 (b) ML^2 /2 (c) 3ML^2 /4 (d)
ML^2.
ankle joint?
A)
26 N ∙ m B) 36 N ∙ m C) 16 N ∙ m D) 21
N ∙ m E) 12 N ∙ m
5.
Two objects, of masses 6 and 8 kilograms,
are hung from the ends of a stick that is 70 cm
long and has marks every 10 cm, as shown. If
3.
Five forces act on a rod that is free to
pivot at point P, as shown in the figure. Which of
these forces is producing a counter-clockwise
torque about point P? (There could be more than
one correct choice.)
A)
force A
C) force C
B) force B
D) force D
E) force E
the mass of the stick is negligible, at which of
the points indicated should a cord be attached if
the stick is to remain horizontal when suspended
from the cord?.
A) A (B) B (C) C (D) D (E)E