A ventilation fan has blades 0.25 m in radius rotating at 20 rpm.What is the tangential speed of each blade tip?
A)0.020 m/s
B)0.52 m/s
C)5.0 m/s
D)20 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 blade, and ω is the angular velocity.
Substituting the given values, we get:
v = 0.25 x 2π x 20 = 2.5π = 7.85 m/s
However, we need to find the tangential speed of each blade tip, which is half the circumference of the circle with radius 0.25 m. 
Therefore, the tangential speed of each blade tip is:
v = (0.5 x 2π x 0.25 x 20)/60 = 0.52 m/s
Hence, the correct answer is B) 0.52 m/s.

A Ventilation Fan Has Blades 0