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.)
        
             
        
        
        
Answer:
Explanation:
The weaker force is pulling to direction East(450 newton)
the net force is (500-450=50 newton) and will move toward west ( in 500 newton direction)
 
        
             
        
        
        
The person driving the truck was killed
the wall was destroyed
        
             
        
        
        
Answer:

Explanation:
<u>Motion with Constant Acceleration</u>
A body moves with constant acceleration when the speed changes uniformly in time. The equation used to find the final speed vf is

Where vo is the initial speed, a is the acceleration, and t is the time.
The cyclist has an initial speed of vo=10 miles/hour and ends up at vf=20 miles/hour in t=5 seconds.
Both speeds are given in miles/hour and we must convert it to m/s:
1 mile/hour = 0.44704 m/s
10 mile/hour = 4.47 m/s
20 mile/hour = 8.94 m/s
The acceleration is calculated by solving for a:



 
        
             
        
        
        
What happens when you pour water in a glass? It takes the shape of the glass. This means that water can't have a fixed shape or volume