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HW Ch. 12
Static Equilibrium and Elasticity
Chapter 12: Static Equilibrium and Elasticity
Conceptual problems
12.C.
1
(5.00)
The sketch shows a rod divided into five equal parts. The rod has negligible
mass and a fixed pivot at point c. An upward force of magnitude
F
is applied at
point a, and an identical force is applied at point f, as shown. At what point on
the rod could you apply a third force of the same magnitude
F
, perpendicular to
the rod, either upward or downward, so that the net torque on the rod is zero?
Check all of the points for which this is possible.
a
b
c
d
e
f
Answer is B and D
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12.C.
4
(5.00)
(a) Which point is the proportionality limit? (b) Which point is the rupture point?
(c) Which point is the elastic limit?
(a)
Point 1Point 2Point 3Point 4Point 5Point 6
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(b)
Point 1Point 2Point 3Point 4Point 5Point 6
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(c)
Point 1Point 2Point 3Point 4Point 5Point 6
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12.C.
5
(5.00)
Suppose you have four rods made of four different materialsaluminum, copper,
steel and titanium. They all have the same dimensions, and the same force is
applied to each. Order the rods from smallest to largest by how much each
stretches.
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View Full DocumentAluminumCopper
SteelTitanium
(0/2 submissions used)
,
Aluminum
CopperSteelTitanium
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,
AluminumCopperSteel
Titanium
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,
AluminumCopperSteelTitanium
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Section 1: Static equilibrium
12.1.1
(5.00)
Two children sit
3.20
m apart on a very lowmass horizontal seesaw with a
movable fulcrum. The child on the left has a mass of 29.0 kg, and the child on
the right has a mass of 38.0 kg. At what distance, as measured from the child on
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 Spring '08
 Broyles
 Force, Mass, Static Equilibrium

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