The answer is false. The speed of the astronaut cancels out the force of gravity, causing a 'stationary freefall'. While under these effects, it is not required for an astronaut to 'strengthen' his body.
        
                    
             
        
        
        
Solution :
Acceleration due to gravity of the earth, g 

Acceleration due to gravity at 1000 km depths is :


   
   
  = 8.23 m/s
Acceleration due to gravity at 2000 km depths is :


   
   
  = 6.73 m/s
Acceleration due to gravity at 3000 km depths is :


   
   = 5.18 m/s
Acceleration due to gravity at 4000 km depths is :


   
   
  = 3.64 m/s
         
 
        
             
        
        
        
Answer:
Option D: 21.8 degrees
Explanation:
In a parallel RL circuit, the current in the resistor R and that in the inductor L are separated among themselves 90 degrees as illustrated in the attached image. In the image the current in the resistor is represented in orange, that of the inductor in blue, and the total current (vector addition of the previous two) is represented  in red, forming a certain angle (theta) with respect to the current in the resistor. The output voltage is the same as the input voltage as measured over the resistor R. 
Therefore, the phase angle that separated output voltage and total current can be obtained using the fact that tan(phase angle) =  , therefore the angle is the arctangent of 4/10:
, therefore the angle is the arctangent of 4/10:
 degrees.
 degrees.
 
        
                    
             
        
        
        
The answer to your question is "A. a lower frequency of the siren.
Because the person in back of the ambulance will hear a lower frequency of the siren. This is because the waves are stretched out. A longer wavelength results in a lower frequency.
 
        
                    
             
        
        
        
<span>The two foremost forces that were involved in the creation of the Cascade mountains are those of the tidal and tectonic forces. Tidal forces helped in eroding anything that was there previously, and the tectonic forces caused the eruption of these mountains to take place.</span>