大家好，最近在做課本上的習題，由於簡諧運動這部分，跟高中有很大的不同，搞的我 霧濛濛，不會的問題很多，在此提出幾題，藉以釐清觀念，煩請前輩們不吝指教 1.In Fig. 15-39, block 2 of mass 2.20 kg oscillates on the end of a spring in SHM with a period of 28.00 ms. The position of the block is given by x= (1.80 cm) cos(ωt + π/2). Block 1 of mass 4.40 kg slides toward block 2 with a velocity of magnitude 5.50 m/s,directed along the spring's length. The two blocks undergo a completely inelastic collision at time t = 7.00 ms. (The duration of the collision is much less than the period of motion.) Q:What is the amplitude of the SHM after the collision? 圖:http://ppt.cc/DeNB 這題牽涉到很多部分，碰撞時的位置也要考慮進去，讓我不知從何下手@@ 2. The 3.30 kg cube in Fig. 15-45 has edge lengths d = 7.60 cm and is mounted on an axle through its center. A spring (k = 1150 N/m) connects the cube's upper corner to a rigid wall. Initially the spring is at its rest length. If the cube is rotated 3.00° and released, what is the period of the resulting SHM? 圖:http://ppt.cc/F_sF 第一次遇見這種題目|||Orz，也是不知道該怎麼下手 3.A 1500 kg car carrying four 75 kg people travels over a “washboard” dirt road with corrugations 3.5 m apart. The car bounces with maximum amplitude when its speed is 15 km/h. Q: When the car stops, and the people get out, by how much does the car body rise on its suspension? 4.The suspension system of a 2200 kg automobile "sags" 9.2 cm when the chassis is placed on it. Also, the oscillation amplitude decreases by 49% each cycle. Estimate the values of Q:(a) the spring constant k and (b) the damping constant b for the spring and shock absorber system of one wheel, assuming each wheel supports 550 kg. 3.4題感覺是很類似的題目，不過我連題目都讀不太懂就是了...QQ" 5.In the overhead view of Fig. 15-46, a long uniform rod of mass m = 0.21 kg is free to rotate in a horizontal plane about a vertical axis through its center. A spring with force constant 110 N/m is connected horizontally between one end of the rod and a fixed wall. When the rod is in equilibrium, it is parallel to the wall. Q:What is the period of the small oscillations that result when the rod is rotated slightly and released? 圖:http://ppt.cc/wryK 這題我想要用力的概念去做，但是題目沒有給我棍長，讓我覺得式子怪怪的，不知道該 怎麼去解出我想要的東西 以上問題，煩請板友們解惑，感激不盡 m(_ _)m --

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