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In Fig. 11-30, a constant hori-
zontal Force \( \vec{F}_{\text {app }} \) of magni-
tude \( 10 \mathrm{~N} \) is applied to a
wheel of mass \( 10 \mathrm{~kg} \) and
radius \( 0.30 \mathrm{~m} \). The wheel
rolls smoothly on the hori-
zontal surface, and the
acceleration of its center
of mass has magnitude
Figure 11-30
\( 0.60 \mathrm{~m} / \mathrm{s}^{2} \). In unit-vector
notation, what is the frictional force on the wheel?
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