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...
(a)(i) Use the unit MJ kg-1 to deduce what is meant by energy density... [1 1](ii) Determine the rate of consumption of natural gas in the power stations.rate...kg s-1 [2](b) The radiant power of the Sun is 3.90 x 1026 W. The average radius of the Earth's orbit about...
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...
4 (a)Explain what is meant by the internal energy of a gas.[1](b) An ideal gas has a volume of 1.8×10-3 m3 at a pressure of 3.3×105 P a and a temperature of 37 C.(i)Show that the number of molecules in the gas is 1.4× 1023.[1](ii)The gas expands so that its v...
6(a) Explain what is meant by(i) a progressive wave,[2](ii) the diffraction of a wave.[2](b) Two microwave sources S1 and S2 are situated as shown in Fig. 6.1. The waves emitted by the two sources are in phase and are polarised in the same plane.1》P -5.0cm o-1S2一一3.2...
(a) (i) What is meant by the term enthalpy change of hydration, △H_1°_(2)=30°(ii) Write an equation that represents the AHayd of the Mg2+ ion.(iii) Suggest a reason why AHfy a of the Mg2+ ion is greater than AHyd of the Ca2+ ion.(iv) Suggest why it is impossible to...
百度试题 结果1 题目(a) State what is meant by a gravitational field. bó 1...。[1] 相关知识点: 试题来源: 解析 Region of space in which a mass experiences a force 反馈 收藏
结果1 题目(c) What is meant by the term unsaturated hydrocarbon?unsaturated hydrocarbon 相关知识点: 试题来源: 解析 (contains) double bond/ triple bond/ multiple bond(s)/not all bonds are single(contains) carbon and hydrogen only 反馈 收藏 ...
解析 The frequency of a progressive wave is the number of cycles of the wave that pass a fixed point per unit time. 频率是指单位时间内波形重复的次数。对于进行波来说,频率指的是单位时间内波形经过某一点的次数。 简而言之,频率代表了波的振动速度,它决定了波的音调或颜色。
(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 ...