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In Fig. 10.4, what is the relation between the radius through the point of contact and the ground line along which the wheel moves? 
AThey are parallel.
BThey are equal in length.
CThey are perpendicular.
DThey intersect at two points.
Answer & Solution
Correct answer: C. They are perpendicular.
The ground line acts as a tangent to the wheel at the point of contact. The radius drawn to the point of contact is perpendicular to the tangent, so the radius and the ground line are perpendicular.
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