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Q: How much force F does the small cylinder piston bear to make the big piston jack up the heavy object?
F 1*S 1 = F2*S2

F 1 = mg = 5000*9.8N = 49000N

s 1 = pi*r 1^2 = 3. 14 * 50 * 50 mm^2

S2 = pi*r2^2 = 3. 14 * 10 * 10 mm^2

F2 = F 1*S 1/S2

You do the rest yourself.

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