Question

give me the answer ....
fast!!!!
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Answer 1

1/2

because it can fall or cannot fall total samplespace 2 for falling it's probability 1/2

Answer 2

Hey!!

Here is your answer -

Let

• the the total weight of the fan be  10kg .
• the external diameter of Down rod is  2cm .
• the internal diameter of Down rod is  1cm .
• the diameter of the mounting bracket’ bolt is  30mm .

Analysing mounting bracket:

The bolt of mounting bracket will experience a flexural stress.

Using the bending equations formula,

(M/I)=(f/y)  

(0/(3.142∗(304)/64))=(f/15)  ( M  is zero since the hanging load acts at the point of supports on the bolt of the mounting bracket)

The bending stress experienced by the bolt comes out to be  0Pa .

Analysing down rod

The down rod experiences a normal vertical stress due to the load of the fan

Therefore, the normal stress experienced by the down rod is

f=(W/A)  

=>f=((10∗9.81)/((3.142∗((202)−(102))/4)  

Stress is  0.416MPa  which is way less than the endurance limit of the mild steel.

Hence, the rod has zero (or theoretically negligible) probability to fail.