A rigid cylinder rolls at constant speed without slipping on top of a horizontal plane surface. The acceleration of a point on the circumference of the cylinder at the moment when the point touches the plane is
B. directed backward
C. directed up
D. directed down
E. zero
(GR9277 #40)
Solution:
Constant speed → no tangential acceleration → Uniform Circular Motion
When the point touches the plane,
Answer: C
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