ANSWER
5.77
Step-by-step explanation
Given:
• The diameter of the input cylinder, d₁ = 3.2 in
,
• The input force, F₁ = 485 lb
,
• The diameter of the output cylinder, d₂ = 9.2 in
,
• The output force, F₂ = 2800 lb
Find:
• The actual mechanical advantage, AMA
The mechanical advantage is given by,

Replace the known values and solve,

Hence, the actual mechanical advantage of this jack is 5.77, rounded to the nearest hundredth.