Answer:
To determine the fluid gage pressure that must be maintained in the hydraulic lift, you need to use the equation for force, which is:
Pressure = Force / Area
Where:
Pressure is in units of kPa (kilopascals)
Force is in units of N (newtons) and is equal to the weight of the car (1620 kg) multiplied by the acceleration due to gravity (9.81 m/s^2)
Area is in units of m^2 (square meters) and is equal to the output diameter of the lift (22.8 cm) converted to meters (0.228 m)
So the pressure that must be maintained is:
Pressure = (1620 kg * 9.81 m/s^2) / (0.228 m^2)
Pressure = (15,847.2 N) / (0.228 m^2)
Pressure = 69,844 kPa
So the fluid gage pressure that must be maintained is 69,844 kPa.