SAT2物理练习题3道.

2017-08-06 作者： 357阅读

　　下面为大家整理的是关于SAT2物理练习题的部分，后面附有详细的答案解析。大家在准备报名SAT2考试的时候，物理一直都是最受青睐的选项之一。下面希望通过对练习题的准备，大家能对相关的知识点有更多的理解和掌握。

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　　1. How much work is done by lifting the object to the top of the building?

　　(A) 1000 J

　　(B) 1500 J

　　(D) 9800 J

　　(E) 14700 J

　　2. What is the approximate kinetic energy of the object as it reaches ground level?

　　(A) 750 J

　　(B) 1500 J

　　(D) 7350 J

　　(E) 9800 J

　　3. A light illuminates a metal surface causing photoelectrons to be emitted. Which of the following most specifically accounts for the energies of the emitted electrons?

　　(A) Velocity of incident light

　　(B) Velocity of emitted electrons

　　(D) Frequency of incident light

　　(E) Mass of emitted electrons

　　Explaination

　　1. The correct answer is (D).

　　Work is dined as the product of the force applied and the displacement of the object in the direction of the force:

　　W=F·d

　　Thus, the work involved in lifting an object involves the object’s weight (its force) and the distance the object is lifted. The distance is simply the height (h) of the building. Substituting:

　　W= F · d

　　=mgh

　　=(10k) (9.8m/s2)(100m)

　　=9800J

　　This value represents the object’s potential energy at that height.

　　2. The correct answer is (E).

　　As frictional forces are negligible, the potential energy will be converted to kinetic energy. Therore, the potential energy at the top of the building equals the kinetic energy at the bottom.

　　3. The correct answer is (D).

　　Recall that energy is related to frequency by the relationship:

　　E = hu

　　where h is Planck’s constant and u is frequency

　　Therore, as the frequency of the incident light increases, the energy imparted to the surface will also increase.

　　以上就是这3道SAT2物理练习题的全部内容介绍，非常详细。大家可以在备考自己的SAT2物理考试的时候，针对自己的实际情况对相关的内容做总结，并根据知识点的不同进行适当的练习。

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