D) Kilograms is the standard unit of mass
        
             
        
        
        
Answer:
it can contaminate the water 
Explanation:
I hope this helps ;)
 
        
             
        
        
        
Answer: m= 2.16 kg
Explanation: Momentum is expressed in the following formula:
p = mv
Derive to find m:
m = p / v
 = 4.75 kg.m/s / 2.2 m/s
 = 2.16 kg
Cancel out m/s and the remaining unit is in kg.
 
        
                    
             
        
        
        
Which object? More information is needed to answer this question
 
        
             
        
        
        
Answer:
3.63 s
Explanation:
We can solve the problem by using the equivalent SUVAT equations for the angular motion. 
To find the angular acceleration, we can use the following equation:

where
 is the final angular speed
 is the final angular speed
 is the initial angular speed
 is the initial angular speed
 is the angular distance covered
 is the angular distance covered
 is the angular acceleration
 is the angular acceleration
Re-arranging the formula, we can find  :
:

Now we want to know the time the bit takes starting from rest to reach a speed of  . So, we can use the following equation:
. So, we can use the following equation:

where:
 is the angular acceleration
 is the angular acceleration
 is the final speed
 is the final speed
 is the initial speed
 is the initial speed
t is the time
Re-arranging the equation, we can find the time:
