Answer:
0.75m/s^2
Explanation:
3.6-1.2=2.4 m/s (Change in velocity)
2.4/3.2=0.75 m/s/s or m/s^2 
 
        
             
        
        
        
Answer:
0.22 km/h
Explanation:
72 hours in 3 days
16/72 = 0.222222222
round to 0.22 km/h
For future reference, Distance/Time= Speed
 
        
             
        
        
        
a) 1.48 m/s
The tuning fork is moving by simple harmonic motion: so, the maximum speed of the tip of the prong is related to the frequency and the amplitude by

where
 is the maximum speed
 is the maximum speed
 is the angular frequency
 is the angular frequency
A is the amplitude
For the tuning fork in the problem, we have
 , where f is the frequency
, where f is the frequency
 is the amplitude
 is the amplitude
Therefore, the maximum speed is

b)  
The fly's maximum kinetic energy is given by

where
 is the mass of the fly
 is the mass of the fly
 is the maximum speed
 is the maximum speed
Substituting into the equation, we find

 
        
             
        
        
        
Answer:
a) The perimeter of the rectangle is 29.4 centimeters.
b) The uncertainty in its perimeter is 0.8 centimeters. 
Explanation:
a) From Geometry we remember that the perimeter of the rectangle ( ), measured in centimeters, is represented by the following formula:
), measured in centimeters, is represented by the following formula:
 (1)
 (1)
Where:
 - Width, measured in centimeters.
 - Width, measured in centimeters.
 - Length, measured in centimeters.
 - Length, measured in centimeters.
If we know that  and
 and  , then the perimeter of the rectangle is:
, then the perimeter of the rectangle is:


The perimeter of the rectangle is 29.4 centimeters.
b) The uncertainty of the perimeter ( ), measured in centimeters, is estimated by differences. That is:
), measured in centimeters, is estimated by differences. That is:
 (2)
  (2)
Where:
 - Uncertainty in width, measured in centimeters.
 - Uncertainty in width, measured in centimeters.
 - Uncertainty in length, measured in centimeters.
 - Uncertainty in length, measured in centimeters.
If we know that  and
 and  , then the uncertainty in perimeter is:
, then the uncertainty in perimeter is:


The uncertainty in its perimeter is 0.8 centimeters.