Masses m 1 = 5 , m 2 = 10 , and m 3 = 20 are positioned on a weightless beam as shown in the accompanying figure. (a) Suppose that the fulcrum is positioned at x = 5 . Without computing the sum of moments about 5 , determine whether the sum is positive, zero, or negative. Explain. (b) Where should the fulcrum be placed so that the beam is in equilibrium?
Masses m 1 = 5 , m 2 = 10 , and m 3 = 20 are positioned on a weightless beam as shown in the accompanying figure. (a) Suppose that the fulcrum is positioned at x = 5 . Without computing the sum of moments about 5 , determine whether the sum is positive, zero, or negative. Explain. (b) Where should the fulcrum be placed so that the beam is in equilibrium?
Masses
m
1
=
5
,
m
2
=
10
,
and
m
3
=
20
are positioned on a weightless beam as shown in the accompanying figure.
(a) Suppose that the fulcrum is positioned at
x
=
5
. Without computing the sum of moments about
5
, determine whether the sum is positive, zero, or negative. Explain.
(b) Where should the fulcrum be placed so that the beam is in equilibrium?
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