20. A hydraulic lift raises a 2000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston? Note that the acceleration due to gravity g = 9.8 m/s2.
(A) 40 cm2
(B) 80 cm2
(C) 196 cm2
(D) 392 cm2
(E) 160 cm2
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統計: A(5), B(1), C(0), D(5), E(0) #3224666
統計: A(5), B(1), C(0), D(5), E(0) #3224666