Kinematics Question 728
Question: An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan rotating at 1200 r.p.m. The acceleration of a point on the tip of the blade is about[CBSE PMT 1990]
Options:
A) 1600 $ m/{{\sec }^{2}} $
B) 4740 $ m/{{\sec }^{2}} $
C) 2370 $ m/{{\sec }^{2}} $
D)5055 $ m/{{\sec }^{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ {{\omega }^{2}}r=4{{\pi }^{2}}n^{2}r $ =$ 4{{\pi }^{2}}{{( \frac{1200}{60} )}^{3}}\times 30 $
$ =4740m/s^{2} $
