A small sphere [img=14x19]1803277aebb0146.png[/img] with mass m moves from the same height to the ground along three different paths. It is assumed that the initial velocity is zero and all frictions can be neglected. If the velocities of the sphere when it reaches the ground are [img=16x17]1803277af50bf6c.png[/img], [img=15x17]1803277afd4c34c.png[/img] and [img=15x17]1803277b05a80ad.png[/img],respectively, then[img=613x182]1803277b133657e.png[/img]
A: [img=92x23]1803277b1bc7064.png[/img]
B: [img=92x23]1803277b24d87f0.png[/img]
C: [img=92x17]1803277b2d043c5.png[/img]
D: [img=92x23]1803277b35385b3.png[/img]
A: [img=92x23]1803277b1bc7064.png[/img]
B: [img=92x23]1803277b24d87f0.png[/img]
C: [img=92x17]1803277b2d043c5.png[/img]
D: [img=92x23]1803277b35385b3.png[/img]
举一反三
- 函数[img=74x45]1803555b5234bfa.png[/img]在x=2,y=1处的全微分为( ) A: [img=92x23]1803555b5ac0b9b.png[/img] B: [img=70x23]1803555b638ff4f.png[/img] C: [img=92x23]1803555b6b1dc84.png[/img] D: [img=78x23]1803555b739d628.png[/img]
- 函数[img=74x45]180355634c44dbb.png[/img]在x=2,y=1处的全微分为( ) A: [img=92x23]180355635539dd0.png[/img] B: [img=70x23]180355635d7f9d8.png[/img] C: [img=92x23]180355636623361.png[/img] D: [img=78x23]180355636e27dba.png[/img]
- 函数[img=74x45]1803554e2ecdc5b.png[/img]在x=2,y=1处的全微分为( ) A: [img=92x23]1803554e373f9b8.png[/img] B: [img=70x23]1803554e3fde144.png[/img] C: [img=92x23]1803554e491649f.png[/img] D: [img=78x23]1803554e513b7ec.png[/img]
- 在下列命题中:如果f(x)=[img=28x44]17e0bf9914bb2f1.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=28x44]17e0bf992111a1c.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=55x44]17e0bf992d8de0a.png[/img],那么[img=29x29]17e0bf9939482bb.png[/img]f(x)不存在;如果f(x)=[img=87x53]17e0bf99450fa82.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0。其中错误命题的个数是( A: 0 B: 1 C: 2 D: 3
- 已知f(x)=x,g([img=17x17]1803ba6e9f63ed6.png[/img],[img=17x17]1803ba6ea7375f0.png[/img],[img=17x17]1803ba6eaef4fad.png[/img])=[img=17x17]1803ba6e9f63ed6.png[/img]*([img=17x17]1803ba6ea7375f0.png[/img] +1), 其中x,[img=17x17]1803ba6e9f63ed6.png[/img],[img=17x17]1803ba6ea7375f0.png[/img] ,[img=17x17]1803ba6eaef4fad.png[/img]均为自然数,新函数h可递归的构造如下:h(0,x) = f(x), 且h(S(n), x) = g(h(n,x),n,x),请按递归式进行计算下列式子,不正确的是_____。 A: h(1,x) = x B: h(2,x) = 2x C: h(3,x) = 6x D: h(4,x) = 12x