A ventilation fan has blades 0.25 m in radius rotating at 20 rpm.What is the tangential speed of each blade tip?
A) 0.02 m/s
B) 0.52 m/s
C) 5.0 m/s
D) 20 m/s

Question

Quizplus · Accepted Answer

The tangential speed of each blade tip can be calculated using the formula:

v = rω

where v is the tangential speed, r is the radius and ω is the angular velocity.

Substituting the given values, we get:

v = 0.25 × 2π × 20

v = 0.25 × 40π

v ≈ 3.14 m/s

Therefore, the correct answer is B) 0.52 m/s (rounded to two decimal places).

A Ventilation Fan Has Blades 0