Answer:
Hello your question is incomplete attached below is the complete question
answer : ri ( thickness of wire ) = 14.167 m
Explanation:
attached below is a detailed solution 
using the given data to determine the thickness of wire 
 
        
             
        
        
        
Multiplying the power of any signal by 5 can be described as 
an increase of  6.99 dB .
If the whistle blew at 70 dB initially, and its sound power became 
multiplied by 5, and the whistle and the listener both stayed in
the same places, then the listener would tell you that the whistle 
was now blowing at 76.99 dB . 
(More likely, he would report "77 dB" as he held his ears and winced.)
        
             
        
        
        
Well for starters, gravity keeps things down on Earth. Also, gravity applies its force on to cars to maintain stability by forcing the tires to make constant contact to the ground creating friction between the rubber and road surface allowing the car to be moved. I'm sure someone else has better ideas!
        
             
        
        
        
Temperatures can cause matter to change state.