The cutting cord on a gas-powered weed cutter is 0.20 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) 628 m/s
B) 25 m/s
C) 19 m/s
D) 63 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 radius of the circular motion (which is the length of the cutting cord), and ω is the angular velocity (which can be calculated by multiplying the rotational speed by 2π). Plugging in the given values, we get V = 0.20 m × 20 rev/s × 2π = 25.12 m/s, which can be rounded to 25 m/s. Therefore, the correct answer is B.

The Cutting Cord on a Gas-Powered Weed Cutter Is 0