The blade of a windshield wiper moves through an arc of, Ask an Expert

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The blade of a windshield wiper moves through an arc of 90° in a time of 0.40s. The tip of the blade moves on the arc of a circle that has a radius of 0.45m. What is the magnitude of the centripetal acceleration of the tip of the blade? Hint: A circle is made up of 4 angles of 90.

a) 6.9 m/s²

b) -6.9 m/s²

c) 110.9 m/s²

d) -110.9 m/s²

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