1. 破冰船怎么破冰阅读答案
破冰船的工作原理是靠船上的强大的动力机器在开动的时候,把自己的船首移到冰面上去。船首出现在水面上的时候,就恢复了自己的全部重力,而这个极大的重力就能把冰压碎。它的船首的水下部分倾斜度很大以便于破冰。同时并为了加强作用力,有时候在船首的贮水舱里,还要盛满水——"液体压舱物"。当在遇到冰块的厚度超过半米的时候就要用船的撞击作用来制服它这时候破冰船就向后退,然后用自己的全部质量向冰块猛撞上去。这时候起作用的已经不是重力,而是运动着的轮船的动能;船好像变成了一个速度不大但是质量极大的炮弹,变成了一个撞锤。几米高的冰山,破冰船就得用它坚固的船首猛烈撞击几次,才能把它们撞碎。
不好意思,复制的,欢迎采纳
2. 破冰船如何分等级
当破冰船航行於海面时,船自身的重力等于船所受到的浮力。
它的排水体积为1500㎡,
则浮力F=ρ(海水)gV(排)=1.0*10^3 * 10 * 1500=1.5*10^7 N
则船自身的重力也为1.5*10^7 N
当船冲到冰面上时 船的排水体积变为三分之()???题目中你少写了一个数字,就按三分之二算吧
此时船受到的浮力为1.5*10^7 *2/3=1.0*10^7N
则船对冰层的压力为F=G-F(浮)=1.5*10^7-1.0*10^7=0.5*10^7 N
船与冰接触面积为5㎡,则压强为P=F/S=0.5*10^7 /5=1.0*10^6 Pa=1 MPa
即当船冲到冰面上时,船的排水体积变为三分之二,船与冰接触面积为5㎡,此时破冰船对冰层的压强为1.0*10^6 Pa
3. 三年级上册语文课文《喜爱音乐的白鲸》段意怎么写
1. 援助(救助) 绝望(失望)
2. 聪明(愚笨) 古典(现代)
3. 白鲸遇难的原因是:因为贪吃贪玩,忘记回家的时间。路上出现了寒流,白鲸回家的路被冰层阻挡,导致白鲸回不了家。
4. 我觉得猎人的功劳最大。因为是他发现遇难的白鲸,在第一时间向附近的村庄报了信。
5. 猎人先发现了遇难白鲸,然后通知了附近的村民,村民纷纷赶来凿冰救助,接着通知了政府,政府派出了破冰船来凿冰。在直升飞机的指引下,破冰船为白鲸开出了一条通道,最后用音乐吸引白鲸,让白鲸游出了冰区得救了。
6.当时这群白鲸会想:太好了,我们终于能回家了,谢谢你们,我们一定会报答你们的。
4. 用英语详细介绍破冰船
An icebreakeris a special-purpose ship or boat designed to move and navigate through ice-covered waters. Although the term usually refers to ice-breaking ships, it may also refer to smaller vessels (e.g., icebreaking boats that were used on the canals of Great Britain in the days of commercial carrying).
For a ship to be considered an icebreaker, it requires three traits most normal ships lack: a strengthened hull, an ice-clearing shape, and the power to push through ice-covered waters.
To pass through ice-covered water, an icebreaker uses its great momentum and power to drive its bow up onto the ice, breaking the ice under the immense weight of the ship. Because a buildup of broken ice in front of a ship can slow it down much more than the breaking of the ice itself, the speed of the ship is increased by having a specially designed hull to direct the broken ice around or under the vessel. The external components of the ship's propulsion system (propellers, propeller shafts, etc.) are at even greater risk of damage than the vessel's hull, so the ability of an icebreaker to propel itself onto the ice, break it, and clear the debris from its path successfully is essential for its safety.