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} $



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