课程名称︰普通物理学甲上 课程性质︰大一 课程教师︰王名儒 开课学院： 开课系所︰数学系 考试日期（年月日）︰I/12/2016 考试时限（分钟）：约110分钟 试题 : 1. A 1000 kg car carrying four 60 kg people travels over a rough washboard dirt road with corrugations 12 m apart, which cause the car to bounce on its spring suspension. The car bounces with maximum vertical velocity when its speed is 60 km/h. The car now stops and the four people get out. By how much does the car body rise on its suspension owing to this decrease in mass？ 2. Two string waves propagating towards +x direction with functional fores A*sin(kx-ɯt) and A*sin(kx-ɯt+π/6),, Find out the functional form.of the combined wave. 3.What is the energy stored between two nodes of the followingstanding wave y(x,t)=Asin(kx)cos(ɯt) on a string? 4.A diagnostic ultrasound echo is renected Rom moving blood and retums with a frequency 500Hz lower than its original 2.0MHZ,What is the speed of the blood? 5.A sphere of radius 0.35m, temperature 27C, and emissivity 0.85 is located in an environment of temperature 77C. What is the total energy change of this sphere in 3.0 min? 6.What is the mean free path for oxygen molecules at temperature of 300 K and pressure of 1.0 atm? Assume that molecular diameter is 300pm and the gas is ideal. 7.Find out the pert`omzance coefficient of a Carnot redigerator operated between a high temperature reservoir of 37oC and a low temperature reservoir of-3度C. 8.Write down the Maxwell distribution of the molecular speed of an ideal gas and show that the average speed of the molecule. 9.One mole of an ideal monatomic gas, at an initial pressure of 5.0 kPa and initial temperature of 600 K, expands fore its initial volume to I final volume Vf2.0 m^3 with final pressure of 2.0 kPa. What is theentropy change of the gas during this expansion? 10.Describe properties of the electrical charge and estimate the electrical field experienced by an electron at a distance of 0.1 nm away ftom the hydrogen nucleus. --

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