Answer:
Tech B is correct and Tech A is incorrect. 
Explanation:
Here Tech A is wrong because when diagnosing an overheating hydraulic system, it is not necessary to un plugg the oil cooler rather it should be plugged to for proper diagnosis. 
Technician B says running the hydraulic system at a lower operating temperature will reduce the possibly of oil oxidation is correct statement because at temperature oil's physical as well as chemical property tend to change. 
Hence, Tech B is correct and Tech A is incorrect. 
 
        
             
        
        
        
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.
        
                    
             
        
        
        
Answer:
(a) The ratio of the pressure amplitude of the waves is 43.21
(b) The ratio of the intensities of the waves is 0.000535
Explanation:
Given;
density of gas,  = 2.27 kg/m³
 = 2.27 kg/m³
density of liquid,  = 972 kg/m³
 = 972 kg/m³
speed of sound in gas,  = 376 m/s
 = 376 m/s
speed of sound in liquid,  = 1640 m/s
 = 1640 m/s
The of the sound wave is given by;

Where;
 is the pressure amplitude
 is the pressure amplitude

(b) when the pressure amplitudes are equal, the ratio of the intensities is given as;

 
        
             
        
        
        
Answer:
0.958 m
Explanation:
So the total mass of the system is
M = 1.93 + 2.95 + 2.41 + 3.99 = 11.28  kg
let y be the distance from the center of mass to the origin. With the reference to the origin then we have the following equation



So the center of mass is 0.958 m from the origin