Question

7. An electric fan has blades of length 30cm as measured from the axis rotation. If the fan is
rotating at 1200rpm. The acceleration of a point on the tip of the blade is about.
a) 1600 m/s2
b) 4740 m/s2
c) 2370 m/s²
d) 5055 m/s²​

Answer 1

Answer:

Correct option is

B

4740 ms

−2

1 rpm =

30

π

rads

−1

so ω=1200×

30

π

=40πrads

−1

acceleration of the point at the tip =ω

2

r=(40π)

2

×

100

30

=4737.41ms

−2

and the closest answer is 4740ms

−2

.