Physical properties are those properties which are natural in the material and cannot be permanently altered without changing the material itself, include: weight , [小题1] , thermal and electrical conductivity , rate of thermal expansion, and melting point.A...
6.1(i) The glass core is surrounded by a plastic cladding.State and explain which material has a higher refractive index and explain your answer..[2](ii)The light ray enters the air-glass interface at 45°.Calculate the angle of refraction in the glass core.angle of refraction =...[2]...
mean 意味着，意思是 be meant 这里是个被动语态，一般会出现在问题中 : by 后可接名词性结构What do you mean by ...是你不明白对方为何要做某事或为何这样说,询问意思或意图的句型,比如说 what do you mean by beauty?望采纳 谢谢 ...
这里meant 是mean 的被动语态。例(1)：主动语态： “Forthrightness” means what?被动语态： What is meant by “forthrightness”?例(2)：主动语态： Rita writes a letter.被动语态： A letter is written by Rita.例(3)：主动语态： 一辆车撞死了行人 被动语态： 行人被一辆车撞死...
8.2, draw the charge distribution on the spheres and the electric field around the spheres.A B(d) Point P is at a distance x from the centre of sphere A along the line joining the centres of the two spheres as shown in Fig. 8.3. The radius of A and B is 15 mm and the distance...
题目(a) State what is meant by the photoelectric effect. 相关知识点: 试题来源: 解析 The emission of electrons from the surface of a metal when EM radiation [1] of high enough frequency [1] is incident on the surface. 反馈 收藏
4 (a) State what is meant by the term polarisation when applied to a wave.[1](b)Explain why only transverse waves can be polarised.[2](c)Some films released have enabled viewing in three dimensions (3D). This can be done using two superimposed polarised images on the screen. One of ...
(a) State what is meant by the specific latent heat of fusion (melting) of a substance.[2] 相关知识点: 试题来源: 解析 (a) energy/heat needed to change state of substance/melt(from solid to liquid at constant temperature/ melting point) per kg/per unit mass ...
See Col. Richard Iron, 'What Clausewitz (Really) meant by 'Centre of Gravity', Defence Studies 1/3 (Autumn 2001) pp.109-12.Joe Strange and Richard Iron `Part 1: What Clausewitz (really) Meant by Centre of Gravity,' Understanding Centres of Gravity and Critical Vulnerabilities, (Quantico:...
2 (a) (i) State what is meant by the moment of a force about a point...[1](ii) Fig. 2.1 shows a large crane on a construction site lifting a block of mass 14000 kg.operator's cabin20m AB counterweight block Fig.2.1Calculate the moment about A due to the 14000 kg block su...