The end of the cutting cord on a gas-powered weed cutter is 0.21 m in length.If the motor rotates at the rate of 20 rev/s,what is the tangential speed of the end of the cord?
A)13 m/s
B)4.2 m/s
C)26 m/s
D)2.7 m/s

Question

Quizplus · Accepted Answer

The tangential speed can be calculated using the formula:
v = rω
Where v is the tangential speed, r is the length of the string (0.21 m), and ω is the angular velocity (20 rev/s converted to radians/s, which is 125.66 rad/s).
So, v = 0.21 m x 125.66 rad/s ≈ 26 m/s.
Therefore, the correct choice is C.

The End of the Cutting Cord on a Gas-Powered Weed