Question

A fan can spin at a speed of 15 revolutions per minute. After one second from switching on the fan, if each blade is in the original position of the next blade, how many blades are there in the fan​

Answer 1

Answer:

4

Explanation:

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Answer 2

Answer:

There are $4$ blades in the fan.

Explanation:

• In one full revolution, the distance traveled by the fan's blade is equal to the circumference of the circle.
• The blades of the fan are equidistant from each other.

Step 1:

In $1$ $minute$ or $60$ $sec$ the number of revolutions by the fan $=15$

In $1$ $second$ the number of revolutions $=\frac{15}{60}$

                                                              $=0.25$

Step 2:

As the blades are equidistant from each other and it is given that at the end of one second the blade is at the position of its next adjacent blade. So, number of blades = $\frac{1}{0.25}$

                                    $=4$

Hence, the total number of blades in the fan are $4$.