Physics
In case of uniform circular motion, the acceleration is

Constant in magnitude and directed radially inwards
Variable in magnitude but tangential to the circle
Variable in magnitude but constant in direction
Zero

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.

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