首页学历类考试大学理学
(简答题)

如图(a)所示,一小型迫击炮架设在一斜坡的底端O 处,已知斜坡倾角为α,炮身与斜坡的夹角为β,炮弹的出口速度为v0,忽略空气阻力.求: (1)炮弹落地点P 与点O 的距离OP; (2) 欲使炮弹能垂直击中坡面.证明α和β必须满足并与v0 无关.

正确答案


答案解析

相似试题

  • (简答题)

    如下图所示,一小型迫击炮架设在一斜坡的底端O处,已知斜坡倾角为α,炮身与斜坡的夹角为β,炮弹的出口速度为v0,忽略空气阻力.求: (1)炮弹落地点P与点O的距离OP; (2)欲使炮弹能垂直击中坡面.证明α和β必须满足tanβ=1/2tanα并与v0无关。

    答案解析

  • (单选题)

    如图所示,汽车上使用的集成电路块,其第一脚是()。

    答案解析

  • (单选题)

    ()the Charterer is also the shipper,the bill of lading is usually only a receipt for the goods and a document of title.

    答案解析

  • (单选题)

    ()the Charterer is also the shipper,the bill of lading is usually only a receipt for the goods and a document of title.

    答案解析

  • (填空题)

    The full title of the U.K. is the United Kingdom of ()and ()

    答案解析

  • (简答题)

    绘图题:用勾股定理法,如图E-1(a)所示,在一已知线段AB上的A点处设置一直角。

    答案解析

  • (单选题)

    ()links all suppliers and customers as a chain in a certain product and service.

    答案解析

  • (单选题)

    A () is a receipt for the goods shipped and a document of title to the goods, the possession of a() is equivalent in law to possession of the goods.

    答案解析

  • (单选题)

    万方数据库使用布尔逻辑算符anD./or/not.其中A.anD.B表示()。

    答案解析

快考试在线搜题