Answer:
what's your problem. How may I help you Buddy
 
        
             
        
        
        
Answer:
Explanation:
27dB = 2.7 B
So I / I₀ = 10⁻²°⁷ ,  I₀ is intensity of main sound and I is intensity after reduction. 
= 1.99 X 10⁻³ 
So intensity will reduce by 1.99 X 10⁻³  . 
 
        
             
        
        
        
Answer:
42244138.951 m
Explanation:
G = Gravitational constant = 6.667 × 10⁻¹¹ m³/kgs²
r = Radius of orbit from center of earth
M = Mass of Earth = 5.98 × 10²⁴ kg
m = Mass of Satellite
The satellite revolves around the Earth at a constant speed
Speed = Distance / Time
The distance is the perimeter of the orbit

The Centripetal force of the satellite is balanced by the universal gravitational force

The radius as measured from the center of the Earth) of the orbit of a geosynchronous satellite that circles the earth is 42244138.951 m
 
        
             
        
        
        
The force exerted by the magnetic in terms of the magnetic field is,

Where B is the magnetic fied strength and F is the force.
Thus, if the magnetic A has twice magnetic field strength than the magnet B, 
Then,

Thus, the force exerted by the magnet B is,

Thus, the force exerted by the magnet B on magnet A is 50 N. 
The force exerted by the magnet A exerts on the magnet B is exactly 100 N as given.
Hence, the option B is the correct answer.
 
        
             
        
        
        
Answer: C. 12.6
Explanation: 2*pi*1.8= 11.304
11.304/0.9= 12.56