Answer:

Explanation:
The relationship between the refractive index and the critical angle is given as follows:

where,
η = refractive index = 1.67
θc = critical angle =?
Therefore,


 
        
             
        
        
        
Answer:
0.8726  
Explanation:
We are to convert 1.85 x  
  to
 to 
First, let us convert the numerator from ft3 to m3
1 ft3 = 0.0283 m3
Hence, 
1.85 x  ft3 = 1.85 x
 ft3 = 1.85 x  x 0.0283 m3
 x 0.0283 m3
      = 52.355 m3
Now, let us convert the denominator from minutes to seconds
1 min = 60 sec
Therefore;
1.85 x  
  = 52.355/60
 = 52.355/60  
         = 0.8726  
 
        
             
        
        
        
Answer:
Muscular endurance is the most important factor in performing the activities of daily living.
 
        
             
        
        
        
Answer:
Not be changed
Option: D
<u>Explanation:</u>
The physical quantity which has both ‘magnitude and direction’ is called vector. These vectors are represented by a line and an arrow, <em>the line represent the magnitude and arrow represent the direction of the physical quantity</em>. The vectors are added and subtracted according to the direction of the vectors.
According to the vector law addition while adding vectors direction and length of the vector is not be changed.<em> If the length of the vector changed the magnitude is also changed while so, while adding vectors length must not be changed.
</em>
 
        
             
        
        
        
Answer:
According to Archimedes principle, volume of water displaced = volume of water.
Hence volume of rock is = 1.65L or 1650 cm^3
Explanation: