2012江苏高考物理14题要点突破——不计质量的力学模型

审题能力与构建能力是物理高考中考生所必须具备的能力,它要求考生在高度紧张的环境中能静下心来审题,找到题目所设定的特殊已知条件,从而建立适当的物理模型,找到解决问题的方法.下面以2012年江苏高考物理卷第14题为例分析如何寻找解决问题的突破口并建立模型.     

电学中的一题多解及学生的能力培养

“一题多解法”的目的是引导学生巩固已学的物理概念，透彻、熟练地掌握物理规律，开拓思路，增强分析和解决物理问题的能力。通过“一题多解法”训练，使学生能举一反三、触类旁通，“一题多解法”多用于综合练习和习题课，习题课上“一题一解法”与“一题多解法”相比，“一题多解法”还节省了许多审题时间，加大了每节课的信息量。下面例举电学教学中“一题多解法”培养学生分析和解决问题的能力。     

物理测试失误分析

测验考试中学生往往会出现这样哪样的失误.如何让学生减少测试失误,考出应有的水平呢?就此加以讨论.1 审题马虎粗心 审题是解题的起点,也是关键,而学生在考试中往往为了“争时间、抢速度”.轻视了这关乎全题的环节.     

用“数形结合”的思维方法巧解2013年高考物理压轴题

2013年高考全国理综卷(适用于广西)物理部分最后一题,是一道推陈出新、独具选拔功能的创新题,在涉及高中物理的主干知识的同时,既考查学生用物理知识及其规律分析相关问题的能力,又考查学生运用数学知识解决物理问题的能力(包括作图能力),是符合新课改思想和锤炼物理思维的好题.但在命题组给出的参考解答中却体现如下4个特     

一题多变教学实例

在物理教学中采用一题多变的方法,可以从不同侧面对学生进行考查.通过题设条件的变化,让学生主动参与比较、分析、总结,从而可以更好地对物理概念、物理规律的理解,也可节约审题时间,从而可以大大提高课堂效率.     

例谈解题中对物理过程分析能力的培养

在解答物理习题时,必须培养学生认真审题,把题目所描述的物理过程搞清楚的习惯．有时一个题目可以从不同的角度去考虑,应用不同的方法去解决．因此对物理过程需要作出具体的分析,经过不断的训练,从而培养和提高学生对物理过程的分析能力和解决物理问题的能力．现仅就一道例题来谈谈这个问题．     

辨析建构物理模型破解实际情境问题

介绍了3种常见物理模型,阐述了辨析、建构物理模型的4种方法,以及如何通过审题和多题归一训练,来实现建构物理模型破解实际情境问题,发展学生的科学思维能力.     

对提高学生解决物理问题能力的思考与建议

在中专物理教学中 ,如何提高学生解决物理问题的能力应是教学过程中不断探究的课题 ,现就这一问题谈些个人的思考与建议 .1　解决问题能力的思考解决物理问题过程中要运用到的思维能力较多 ,主要有以下几方面 :①审视问题获取有效信息的能力　②扩展已知信息的能力　③分析隐含     

物理解题中隐含条件的挖掘——以2019年高考全国Ⅰ卷、Ⅱ卷、Ⅲ卷选择题为例

隐含条件的挖掘和准确把握,在很多时候对于物理问题的快速解决起着关键性的作用,在审题过程中能快速找出隐含条件,并利用隐含条件解题更是在考试过程中准确高效解题的最好方法.本文以2019年高考全国Ⅰ卷、Ⅱ卷、Ⅲ卷选择题为例详细分类探讨了物理解题中隐含条件的挖掘这一问题,希望对于学生如何在题目中快速找出隐含条件有所帮助.     

如何培养学生解决问题的能力

探讨一般科学发现的历程,会对我们如何去培养学生解决问题的能力得到有益的启示.这是因为:(一)科学发现和学生解决问题同样都是发现问题、分析问题和解决问题的过程,所不同的仅是:科学发现的前沿是人类未知的问题而学生解决的虽对学生是未知的,但对人类则是已知的.学生解决问题,可以得到教师的启发、指导,解决问题     

关于"太阳在银河系中所受引力与到银心距离r的关系"的讨论

讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系，指出引力场强g并不是与r的平方成反比，这是由于银河系的大小和形状不能忽略造成的．强调了万有引力定律的适用条件．     

On the predictability of the positions of the convergence zones in the ocean

The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized.     

On the calculation of the bremsstrahlung in the region of the plasma frequency

On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given.     

Dependence of the Intensity of the Spectral Lines and the Composition of the Sample and the Plasma Parameters of the Unipolar Arc

The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration n_e, degree of 6 ionnization α) from concentration of lithium additive.     

Extracting the wavefunction of the LSP at the LHC

We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.     

On the Question of the Source of the Apokamp

Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage...