The second's hand of a watch has length 6 cm. Speed of end point and magnitude of difference of velocities at two perpendicular positions will be
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The second's hand of a watch has length 6 cm. Speed of end point and magnitude of difference of velocities at two perpendicular positions will be

G1 Physics · Accepted Answer

For the second hand, ω=2π/60 rad/s and r=0.06 m, so tip speed v=ωr=2π mm/s. At two positions separated by 90°, the velocity vectors are perpendicular, so |Δv⃗|=√(v²+v²)=2√2π mm/s. Hence D.