(b)State what is meant by the terms(i) element,(substance that) cannot be split up/ broken down into (two or more) simpler substances by chemical means1...OR(substance) made of atoms with the same atomic number/ number of protons/ proton number.on number... [1](ii) compound,(two...
2 (a) State what is meant by kinetic energy.相关知识点: 试题来源: 解析 动能是物体由于其运动而具有的能量。物体运动得越快,其动能就越大。例如,一辆快速行驶的汽车比一辆缓慢行驶的汽车具有更大的动能。 问题要求解释动能的含义。参考答案“动能是物体由于其运动而具有的能量”简洁明了地回答了这个问题,是...
题目 (3) State what is meant by the term alley. 相关知识点: 试题来源: 解析 An alloy is a mixture of metals, or a mixture of a metal and another element. Alloys are defined by a metallic bonding character. Alloys are made to create materials with enhanced properties or desired charact...
The resulting oscillations o f the trolley are simple harmonic.The acceleration a o f the trolley is given by the expression。=-()×where x is the displacement o f the trolley from its equilibrium position.The mass o f the trolley is 840g.Calculate the frequency f o f oscillation o f...
6 (a)State what is meant by critical angle.[1](b)Fig. 6.1 shows the cross-section of an optical fibre. The optical fibre has a very thin glass core with a diameter of 14 um. The refractive index of the glass core is 1.65.plastic cladding十airīglass core Fig. 6.1(i) The glass ...
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 ...
5 (a) State what is meant by the specific latent heat of fusion (melting) of a substance..[2](b)Ice cubes of total mass 70g, and at 0 C, are put into a drink of lemonade of mass 300g.All the ice melts as 23500J of thermal energy transfers from the lemonade to the ice. The...
2 (a) State what is meant by work done.---[1](b) A beach ball is released from a balcony at the top of a tall building. The ball falls vertically from rest and reaches a constant (terminal) velocity. The gravitational potential energy of the ball decreases by 60J as it f...
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...