SAT2物理練習(xí)題3道.

　　下面為大家整理的是關(guān)于SAT2物理練習(xí)題的部分，后面附有詳細(xì)的答案解析。大家在準(zhǔn)備報(bào)名SAT2考試的時(shí)候，物理一直都是最受青睞的選項(xiàng)之一。下面希望通過對(duì)練習(xí)題的準(zhǔn)備，大家能對(duì)相關(guān)的知識(shí)點(diǎn)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

　　(C) 7350 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

　　(C) 4900 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

　　(C) Size of area illuminated

　　(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.

　　以上就是這3道SAT2物理練習(xí)題的全部?jī)?nèi)容介紹，非常詳細(xì)。大家可以在備考自己的SAT2物理考試的時(shí)候，針對(duì)自己的實(shí)際情況對(duì)相關(guān)的內(nèi)容做總結(jié)，并根據(jù)知識(shí)點(diǎn)的不同進(jìn)行適當(dāng)?shù)木毩?xí)。

澳際傾情回饋客戶，零利潤(rùn)SAT香港考團(tuán)，詳細(xì)信息

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