AP® Physics C: Mechanics 2014 Free-Respon Questions
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招聘信息英文TABLE OF INFORMATION, EFFECTIVE 2012英翻汉在线翻译
meter,
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groupm mole,mol watt,W farad,F kilogram,kg hertz,Hz coulomb,C tesla,T cond,s newton,N volt,V degree Celsius,ampere,A pascal,Pa ohm,W electron-volt,
eV
UNIT SYMBOLS
kelvin,
K
joule,
ande
J
henry,
H
PREFIXES
Factor Prefix Symbol
109giga G 106mega M 103kilo k 10-2centi c 10
-3
milli m
10-6micro m 10-9
nano n 10-12
pico
p
The following conventions are ud in this exam.
I. Unless otherwi stated, the frame of reference of any problem is assumed to be inertial.
II.The direction of any electric current is the direction of flow of positive
charge (conventional current).
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III.For any isolated electric charge, the electric potential is defined as zero at
an infinite distance from the charge.
ADVANCED PLACEMENT PHYSICS C EQUATIONS, EFFECTIVE 2012
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2014 AP ® PHYSICS C: MECHANICS FREE-RESPONSE QUESTIONS
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缅甸语翻译-5-
PHYSICS C: MECHANICS
SECTION II Time—45 minutes
3 Questions
Directions: Answer all three questions. The suggested time is about 15 minutes for answering each of the questions, which are worth 15 points each. The parts within a question may not have equal weight. Show all your work in this booklet in the spaces provided after each part.
Mech. 1.
In an experiment, a student wishes to u a spring to accelerate a cart along a horizontal, level track. The spring
新视野大学英语2is attached to the left end of the track, as shown in the figure above, and produces a nonlinear restoring force of magnitude 2s F As =+Bs , where s is the distance the spring is compresd, in meters. A measuring tape,
marked in centimeters, is attached to the side of the track. The student places five photogates on the track at the locations shown.
(a) Derive an expression for the potential energy U as a function of the compression s . Express your answer in
terms of A , B , s , and fundamental constants, as appropriate.
