Question

how much time is taken for a fan to completely come at rest after it has been switched off ?​

Answer 1

Answer:

Explanation:

We can write the equation of motion for circular motion as:

ω  

2

=ω  

0

2

​  

+2aθ  

n

​  

 

Now, ω=  

2

ω  

0

​  

 

​  

,θ=36×2π (given)

So,  

4

ω  

0

2

​  

 

​  

=ω  

o

2

​  

+2α×36×2π

So, α=  

4×144π

−3ω  

0

2

​  

 

​  

 

2nd case:

0=  

4

ω  

0

2

​  

 

​  

−2×  

4×144π

3ω  

0

2

​  

 

​  

×θ

So, θ=24π

So, number of rotations made by the fan before coming to rest =  

2π

24π

​  

=12

Answer 2

Answer:

The waterfall obliged Taro and changed water into sake. The reason was that he was a thoughtful son. He served his old parents sincerely. Sake was the reward for his goodness.