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悉尼大学商学国贸双硕士毕业，现居澳洲，在澳学习生活15+年，从事教育咨询工作超过10年，澳洲政府注册教育顾问，上千成功升学转学签证案例，定期受邀亲自走访澳洲各类学校
SAT考试是美国高中生进入美国大学的标准入学考试，包括SAT1和SAT2。SAT2是专项测验，有数学、物理、化学、生物、外语等，大部分为选择题，是可以选科的。今天我们来学习SATII物理专题分析 Practice Questions of Work, Energy, and Power，希望对大家的复习有所帮助。
1. How much work does a person do in pushing a box with a force of 10 N over a distance of 4.0 m in the direction of the force?
(A) 0.4 J
(B) 4.0 J
(C) 40 J
(D) 400 J
(E) 4000 J
2. A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box?
(A) 12 J
(B) 40 J
(C) 75 J
(D) 120 J
(E) 400 J
3. How much work does the force of gravity do in pulling a 10 kg box down a 30º inclined plane of length 8.0 m? Note that sin 30 = cos 60 = 0.500 and cos 30 = sin 60 = 0.866.
(A) 40 J
(B) 69 J
(C) 400 J
(D) 690 J
(E) 800 J
4. How much work does a person do in pushing a box with a force of 20 N over a distance of 8.0 m in the direction of the force?
(A) 1.6 J
(B) 16 J
(C) 160 J
(D) 1600 J
(E) 16000 J
5. The figure below is a force vs. displacement graph, showing the amount of force applied to an object by three different people. Al applies force to the object for the first 4 m of its displacement, Betty applies force from the 4 m point to the 6 m point, and Chuck applies force from the 6 m point to the 8 m point. Which of the three does the most work on the object?
Amy GUO 经验： 16年 案例：4272 擅长：美国,澳洲,亚洲,欧洲
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