把同种材,料制成的甲、乙两个正立方体,放在水平桌面上,甲、乙对桌面的压强分别为p1、p2,把甲放在乙上面

令材料密度为p,甲正方体棱长h1,乙正方体棱长h2
∵P1=pgh1,P2=pgh2
∴h1 = P1/(pg),h2 = P2/(pg)
又：G1=pgV1=pgh1^3,G2=pgV2=pgh2^3
把甲放在乙上面,乙对地面的压强：
P = (G1+G2)/h2^2
= (pgh1^3+pgh2^3)/h2^2
= { pg*[P1/(pg)]^3+pg*[P2/(pg)]^3 } / { [P2/(pg)]^2 }
= ( P1^3+P2^3) / P2^2

把题说完整

神聊