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千千万万遍
共计3小时考试时间
此套试卷由两部分组成
25道选择题
以及3道简答题组成
每道大题含有不同数量的小题
完整版下载链接见文末
Data:
Speed of light c =3.00 × 108m/s
Gravitational constant G =6.67 × 10−11N · m2kg2
Acceleration due to gravity g =9.80m/s2
Fundamental charge e =1.60× 10−19 C
Mass of electron me =9.11 × 10−31kg
Mass of proton mp =1.67 × 10−27kg
Coulomb’s constant 1/(4πε0) = 8.99x109 N·m2/C2
Permeability of free space μ0 = 4π × 10−7N/A2
Speed of sound in air vs=343m/s
Index of refactuin of water nw=1.33
Energy conversion 1eV=1.6 x 10-19J
Part A: Multiple Choice
1)A little girl is holding a helium-filled balloon on a string while riding in a closed elevator going down a very tall building at constant speed. The elevator shaft is maintained under vacuum. Suddenly the elevator cable snaps, sending the elevator into free fall. In her surprise the girl lets go of the string. She is even more surprised to see
2)A demonstration apparatus sits on a table in the lab. It consists of a metal track (shown as a thick solid line in the figure below) along which a perfectly spherical marble can roll without slipping. In one run, the marble is released from rest at a height h above the table on the left section, rolls down one side and then up the other side without slipping, briefly stopping when it has reached h1. Assuming the table to be horizontal and neglecting air drag as well as any energy loss due to rolling,
3)In the movie Jurassic Park, as a jeep is being pursued by a dinosaur, one can see the animals in the jeep's side rear-view mirror on which is printed:"Objects in mirror are closer than they appear." Then,
4)a lump od sticky chewing-gum with mass m moves at speed v toward another lump of mass M at rest. They collide and stick together, both moving at speed V. Nothing else is known about the conditions under wihch the collision takes place. Which of the following statements is the most correct?
5)According to the Archimendes principle,
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