课程名称︰普通物理甲上 课程性质︰大一共同必修 课程教师︰黄晖理 开课学院：生农学院 开课系所︰生物产业机电工程学系 考试日期（年月日）︰2009/01/15 考试时限（分钟）：110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : (一) calculation (60% = 15% × 4) 1.A mole of monatomic ideal gas changes from the state (P0,V0) to the state (2P0,2V0). What is the change in entropy? 2.A wave propagates on a string along the +X direction and is totally reflected at x=d, where the string is tied to a post. If the incident wave function is y i (x,t) = A sin( kx-ωt ), what is the reflected wave function yr (x,t)? 3.A pendulum of length L and mass M has a spring of force constant k connected to it at a distance h below its point of suspension as shown in a figure below. Find the period of vibration of the system if the amplitude of vibration is small. Assume the vertical suspension of length L is rigid and its mass is negligible. _____________________ | | |h | | | L |__ /\ ____| | \/ \/ | | k | O M 4.Show that the potential energy for a two particle system is U(r) = － GMm / r （二）Explanation ( 40% = 2.5 × 16 ) 1. Explain what is meant by “the equipartition of energy” 2. What is the total degree of freedom in CO2 molecule? 3 Explain why quantum theory becomes involved in interpreting Cv/R versus temperature for diatomic gas system. 4. It is said to have no change in Eint, heat Q and nor any work W done on or by the system in free expansion. Why then it is accompanied by a change in entropy? 5. Why the free expansion cannot be exactly described in terms of thermodynamic processes? 6. Give a brief explanation about “the second law of thermodynamics”. 7. Why the Avogadro's number for any system of molecule is 6.023X1023 8. Why Cp is always greater than Cv ? 9. What is really meant by ENTROPY? Give a brief explanation. 10. What is the typical thermal energy in unit of ev at room temperature? 11. What is the unique property or condition that a central force can always satisfy? 12. Why a strain or a stress is not a vector? 13. What are the conditions to form a standing wave? 14. Let the Maxwell speed distribution law be written as P(v), give an integral expression of the root-mean-square speed. 15. What causes a rubber band or a balloon to resist stretching?. 16. Explain what is meant by a Carnot Engine. --

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