1.

The second hand of a clock is 3.0cm long. Calculate the speed of the tip of the hand.

Answer»

: π/10 cm/s = 3.141/10 = 0.3141 cm/sexplanation ->one ROTATION time = 60S radius (r) = 3.0cmcircumference = 2π.r = 2π.3 = 6πdistance travelled by the tip of the hand in 60 SECONDS = 6π cmHence speed = distance / time = 6π/60 = π/10 cm/s = 3.141/10 = 0.3141 cm/s



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