※ [本文转录自 NTU-Exam 看板] 作者: stevekuo4 (stevekuo) 看板: NTU-Exam 标题: [试题] 94上 普物甲 石明丰 期末考 时间: Thu Jan 12 11:50:49 2006 课程名称︰普物甲 课程性质︰共同必修 课程教师︰石明丰 考试时间︰2006.1.10 试题 : 一 单选 1.A non-viscous incompressible fluid is pumped steadily into the narow input of a long pipe which has a wide output. The pressure at the input is greater than that at the output. A possible explanation is (a)the fluid speed from input to ouput (b)the fluid speed is the same at the two ends (c)the fluid is flowing uphill (d)the fluid is flowing downhill (e)the fluid is flowing horizontally 2.A sinusoidal wave is generated by moving the end of a string up and down periodically. The generatordoes not supply any power when this end of the string (a)has its least |a| (b)has its greater |d| (c)has half its greatest |d| (d)has on-fourth its greatest|d| (e)has its least |d| 3.The sinuosidal wave y(x,t)=Ym sin(kx-wt) is incident of the fixed end of a string at x=L. The reflected wave is given by (a)y(x,t)=Ym sin(kx+wt) (b)y(x,t)=-Ym sin(kx+wt) (c)y(x,t)=Ym sin(kx+wt-kL) (d)y(x,t)=Ym sin(kx+wt-2kL) (e)y(x,t)=-Ym sin(kx+wt+2kL) 4.Possible units for the coefficientof volume expansion are (a)mm/℃ (b)mm^3/℃ (c)mm^-3/℃ (d)1/℃^3 (e)1/℃ 5.A system undergoes an adiabatic process in which its internal energy energy increases by 20J. Which of the following statement is true? (a)20J of work was done on the system (b)20J of work was done by the system (c)thesystem received heat energy 20J from outside (d)the system lost 20J of energy as heat (e)non of the above 6.A metal of mass M requires a power input P to just remain molten. When the heater if off, the metal solidifies in a time T. The specific laten heat of fusion of this metal is (a)P/MT (b)T/PM (c)PM/T (d)PMT (e)PT/M 7. A "consequence" of the Einstien's theory of relativity is (a)moving clocks seen by an observer at reat tun more slowly than when they are at rest (b)moving rods seen by an observer ar rest are longer than when they are at rest (c)light has both wave and particle properties (d)the laws of physics must appear the same to all observers moving with uniform velocity relative to each other (e)all of th above 8.Two events occour at the same coordinate is (a) 0 (b)0.25c (c)0.56c (d)0.7c (e)o.99c note c=3X10^8m/s 二 问答题 9.(a)Water stans at a depth D behind the certical wall of a dam. Let W be tidth. Find the net horizntal force on the dam from the water and (b)the net torque about a line parallel to the width of the dam. 10.A block of M is suspended from a spring with spring constant k. A bullet of m is fired inte the block from directly below with a speed of v and becomes embedded in the block. (a)What is the ocillation frequency of the resulting simple harmonic motion? (b)Find the amplitude of the resulting somple harmonic motion (c)What fraction of the original kinetic energy of the bullet is transferred to mechanical energy of the harmonic osilator? 11.An Aliminum wire, of lenth 50.0cm, cross-sectional area 1.00x10^-2 cm^2, and density 2.5g/cm^3, is joined to a steel wire, of density 10g/cm^3 and the same sross-sectional area. The compound wire, loaded with a block of mass 50.0kg, is arranged so that the distanct from the joined to the supporting pullet is 75cm. Transverse wave are set up inthe wire by using a n external source of variable frequency; a node is located at the pulley. (a)What are the speed of the string wave? (b)Find the lowest frequency of excitation for which standing waves are observed such that the joint in the wireis one of the nodes. (c)How many nodes are observed at this frequency? 12.A policeman uses a radar gn to measure the speed of car going toward the policeman. The proper frequency of the EM wave sent by the radar gun emitter is f0. If the receiver of the radar gun detects the frequency of the reflected EM wave from the are is f. What is the speed of the car relative to the policeman? 13.The operation of a gasoline combustion engine is represnted by the cycle. Assume the intake mixture is an ideal gass and use a compression ratio of 4:1. Assume that P2=3P1. (a) Determine the presure and temperature at each of the vertex point of the P-V diagram in terms of P1,T1,ane the ratio γ of the molar specific heats of the gas. (b)What is the efficiency of the cycle? (教授会在考试前讲解题目) --

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