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【简答题】
图为一滑梯的示意图,滑梯的长度 AB 为 L = 5.0 m ,倾角 θ = 37°. BC 段为与滑梯平滑连接的水平地面.一个小孩从滑梯顶端由静止开始滑下,离开 B 点后在地面上滑行了 s = 2.25 m 后停下.小孩与滑梯间的动摩擦因数为 μ = 0.3. 不计空气阻力.取 g = 10 m/s 2 . 已知 sin 37° = 0.6 , cos 37° = 0.8. (1) 小孩沿滑梯下滑时的加速度 a 的大小为 __________m/s 2 ; (2) 小孩滑到滑梯底端 B 时的速度 v 的大小为 __________m/s ; (3) 小孩与地面间的动摩擦因数 μ ′=__________.
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【简答题】人文地理学 是地理学中的社会科学,其主要特性是 、 、 。
【单选题】John told us that by the end of the year they together for thi rt y years.
A.
would have been living
B.
woul d have lived
C.
would have been lived
D.
will have been living
【单选题】In the 1950s, the pioneers of artificial intelligence(AI)predicted that, by the end of this century, computers would be conversing with us at work and robots would be performing our house work. But as...
A.
are capable of reliably recognizing the shape of an object
B.
are close to exhibiting humanlike behavior
C.
are not very different in their performance from those of the 50's
D.
still cannot communicate with people in a human language
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