给定液体的表面上一段分界线的长度时L，其表面张力的大小和方向是？ Given the length L of a dividing line on the surface of a liquid, what is the magnitude and direction of the surface tension？A.表面张力与L成正比，力与L垂直且沿液面的切线方向 The surface tension is proportional to L, and the force is perpendicul

题目

给定液体的表面上一段分界线的长度时L，其表面张力的大小和方向是？ Given the length L of a dividing line on the surface of a liquid, what is the magnitude and direction of the surface tension？

A.表面张力与L成正比，力与L垂直且沿液面的切线方向 The surface tension is proportional to L, and the force is perpendicular to L and along the tangent direction of the liquid surface#B.表面张力与L成正比，力与L垂直且与液面垂直指向液体内部. The surface tension is proportional to L, and the force is perpendicular to L and perpendicular to the liquid surface and points to the interior of the liquid.#C.The surface tension is proportional to L, and the force is perpendicular to L and
相似考题

1.The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.A.onto the surface of the burning liquidB.ahead of the burning liquid and bounce it on the fireC.at the base of the burning liquid in a sweeping motionD.just above the surface of the burning liquid

2.Given:Which code, inserted at line 14, allows the Sprite class to compile?()A.Direction d = NORTH;B.Nav.Direction d = NORTH;C.Direction d = Direction.NORTH;D.Nav.Direction d = Nav.Direction.NORTH;

3.Coalescence(聚合) is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and ______in size.A.expandB.extractC.increaseD.decrease

4.下列关于表面张力的叙述中正确的是()。A.表面张力是指液体表面在相邻两相同单位长度上的牵引力B.表面张力的大小与液体内部所受的压力有关，与液体外部所受的压力无关C.液体表面张力的大小与液体的性质无关D.表面张力的大小预测量时的温度有关

参考答案和解析
表面张力与 l 成正比，力与 l 垂直且沿液面的切线方向；
更多“给定液体的表面上一段分界线的长度时L，其表面张力的大小和方向是？ Given the length L of a dividing line on the surface of a liquid, what is the magnitude and direction of the surface tension？”相关问题

  • 第1题：

    The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel's displacement into the ______．

    A.Transverse free surface correction for the vessel

    B.Sum of the vertical moments of the vessel

    C.Sum of the longitudinal free surface moments of the vessel

    D.Longitudinal centerline of the vessel


    正确答案：C

  • 第2题：

    The free surface corrections depend upon the dimensions of the surface of the free liquids and the ______．

    A.volume of liquid in the tank

    B.displacement of the vessel

    C.location of the tank in the vessel

    D.height of the center of gravity of the vessel


    正确答案：B

  • 第3题：

    铺展系数φ与γL-g、γS-g、γS-L的关系是，φ=（），若液体在固体表面上发生铺展，则φ（）0。Fowkes认为，液体的表面张力是各种贡献的总和，可以归纳为两大项，即（）和（）。


    正确答案: γS-g-γL-g-γS-L；＞；色散力的贡献（γd）；极性相互作用的贡献（γp）

  • 第4题：

    对于给定液体表面上一段分界线为l，其表面张力大小和方向：（）

    • A、表面张力与L成正比，力指向液体内部；
    • B、表面张力与L成正比，力与L垂直且沿液面切线方向；
    • C、表面张力与L成反比，力指向液面各个方向；
    • D、表面张力与L成反比，力与L垂直且指向各个方向。

    正确答案:D

  • 第5题：

    单选题
    Which of the following is more important in determining the amount of free surface that will be produced?（）.
    A

    The breath of the tank

    B

    The length of the tank

    C

    The amount of liquid in the tank

    D

    The position of the tank in relation to the center line of the vessel


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    To calculate the free surface correction，it is necessary to divide the free-surface moments by the（）.
    A

    total weight of liquid loads

    B

    total displacement

    C

    lightweight

    D

    deadweight


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    The effects of free surface on a vessel’s initial stability do NOT depend upon the（）.
    A

    volume of displacement of the vessel

    B

    dimensions of the surface of the liquid

    C

    amount of liquid in slack tanks

    D

    specific gravity of the liquid in the tank


    正确答案： C
    解析： 暂无解析

  • 第8题：

    问答题
    The difference between a liquid and a gas is obvious (1)____ the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(describe) the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be “dissolved” in a vapor without losing its identity, and another theory held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.The (7)____(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other (8)____, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.

    正确答案：
    1.on 根据后面的the conditions of可知此处填on。on the conditions of在…条件下。
    2.therefore 这里表因果关系,所以用therefore。句意:气体容易扩散,所以必须保存在密闭的容器里。
    3.case in the case of在…的情况下,就…而言。根据上下文,这里是说“必须将气体存放在一个密封的容器里,如同一颗行星的大气一样。”
    4.describing 本句中的describe的逻辑主语为theories,故应用现在分词。同时,describe这一动作只说明一种事实,并不与其他动词作时间上的先后比较,不必用完成时。
    5.take take approach采用…方法,符合句意。
    6.that that引导定语从句,修饰forms of matter。
    7.fundamental 句意:液体与气体之间的根本相似性在温度和压强有所提高时变得十分明显。
    8.words in other words换句话说。
    9.at 句意:使液体和气体密度相同的那个状态下的温度和压力被称作临界点。句中的temperature and pressure是先行词,需要一个关系词引导一个定语从句修饰先行词。特定数值的temperature和pressure与at搭配,意为“在某个温度和压力下”。
    10.distinguished 句意:在临界点之上时,气体和液体就很难再区分开来。
    解析： 暂无解析

  • 第9题：

    单选题
    Grinding to eliminate shallow surface defects should be done（）.
    A

    parallel to the longitudinal direction of the chain

    B

    perpendicular to the direction of the anchor chain

    C

    diagonally across the link of the anchor chain

    D

    around the circumference of the chain link


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    In the construction of a diesel engine, what is the purpose of end plates?（）
    A

    To provide accessibility to the cylinder liners

    B

    To add stability to the engine block

    C

    To add rigidity to the block and a surface for attaching other parts

    D

    To make a surface for the base


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    What is the principal danger from the liquid in a half full tank onboard a vessel?（）
    A

    Corrosion from the shifting liquid

    B

    Rupturing of bulkheads from the shifting liquid

    C

    Loss of stability from free surface effect

    D

    Holing of the tank bottom from the weight of the shifting liquid


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    The effects of free surface on initial stability depend upon the dimensions of the surface of the free liquids and the（）.
    A

    volume of liquid in the tank

    B

    volume of displacement of the vessel

    C

    location of the tank in the vessel

    D

    height of the center of gravity of the vessel


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which statement about the free surface effect is TRUE ________．

    A.It increases in direct proportion to the length of the tank times the breadth squared

    B.It decreases at increased angles of heel due to pocketing when a tank is 90% full

    C.It decreases in direct proportion to increasing specific gravity of the liquid in the tank

    D.In practice，the correction is considered to be a virtual reduction of KG


    正确答案：B

  • 第14题：

    The free surface effects of a partially full liquid tank decrease with increased ______．

    A.Density of the liquid

    B.Placement of the tank above the keel

    C.Displacement volume of the ship

    D.Size of the surface area in the tank


    正确答案：C

  • 第15题：

    对于给定液体表面上一段分界线长度是l，其表面张力的大小和方向是：（）

    • A、表面张力大小与l成正比，力与分界线垂直且指向液体内部
    • B、表面张力大小与l成反比，力与分界线垂直且指向液体内部
    • C、表面张力大小与l成正比，力与分界线垂直且沿液面的切面方向
    • D、表面张力大小与l成反比，力与分界线垂直且指向表面各个方向
    • E、表面张力与l成正比，力与分界线垂直且与液面垂直指向液体外

    正确答案:C

  • 第16题：

    问答题
    What is the volume of a cube whose surface area is 150?

    正确答案： 125
    解析：
    根据题意，设正方体的每条边长为e，那么根据正方体的表面积公式可得6e²=150→e=5，因此V=53 =125.

  • 第17题：

    单选题
    （） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.
    A

    Setting point

    B

    Dew point

    C

    Flash point

    D

    Lean point


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel’s displacement into the（）.
    A

    transverse free surface correction for the vessel

    B

    sum of the vertical moments of the vessel

    C

    sum of the longitudinal free surface moments of the vessel

    D

    longitudinal centerline of the vessel


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    Given: Which code, inserted at line 14, allows the Sprite class to compile?（）
    A

    Direction d = NORTH;

    B

    Nav.Direction d = NORTH;

    C

    Direction d = Direction.NORTH;

    D

    Nav.Direction d = Nav.Direction.NORTH;


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    If the current and wind are in the same direction，the sea surface represents a wind speed （）.
    A

    lower than actually exists

    B

    higher than actually exists

    C

    that actually exists

    D

    that has no proportional relationship


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
    A

    Great circle

    B

    Equator

    C

    Small circle

    D

    Meridian


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    What is the purpose of a striker plate? （）
    A

    Provides surface for applying force on machinery

    B

    Provides landing surface for the sounding bob

    C

    Absorbs machinery vibration

    D

    Prevents valve stem over-travel


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The effect of free surface on initial stability depends upon（）.
    A

    the amount of liquid in the compartment

    B

    the dimensions of the liquid surface and the vessel's displacement

    C

    only the length of the compartment

    D

    the vertical position of the liquid in the vessel


    正确答案： A
    解析： 暂无解析

  • 第24题：

    单选题
    Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and （） in size.
    A

    expand

    B

    extract

    C

    increase

    D

    decrease


    正确答案： A
    解析： 暂无解析

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