求大神解答 几个回忆题

QzhaoQUID: 3483967

1.Let S be the space of all 3∗k matrices, T be the space of all column vectors consists of seven components.If S is isomorphic to a subspace of T.What are possible values of k？

个人理解是说 s的order 是3*k   它和一个order为7的group的subgroup isomorphic 我就觉得3*k要整除7  貌似不太可能啊……求解答

2.An object is tossing upward with an initial speed of 64feet/s.Suppose the gravitational acceleration is 32feet/s2. Find the smallest t,such that the object reach the height of 96 feet at time t

V0t+1/2at^2=s 貌似算出来压根就到不了96feet啊  

AprilikeUID: 3466292

2感觉题目错了，到不了这么高。
1同问

huweigregogogoUID: 3503590

1、不是subgroup 是 subspace，7纬空间的子空间有1,2,3,4,5,6 维从而，k=1or2

huweigregogogoUID: 3503590

2、你说得对 应该是数据出错了

小硕鼠UID: 3411565

huweigregogogo 发表于 2014-10-22 17:53
1、不是subgroup 是 subspace，7纬空间的子空间有1,2,3,4,5,6 维从而，k=1or2

嗯应该是酱！