19. Suppose the objective function of a government is described by W(u,π) = (u + 5π²) where u is the unemployrent rate, and m is the infation rate, while the Phillips curve is described by is the expected in fation rate, and u is the natural rate of unemployment. Which of the following infation rate is a credible promise that the government can make?
(A) 0%
(B) 2%
(C)5%
(D) 10%

15. Matilda just graduated from college. In order to devote all her efforts to college, she didn't hold a job. She is going to tour around the country on her motorcycle for a month before she starts looking for work. Other things the same, the unemployment rate (A) increases, and the labor-force participation rate decreases. (B) and the labor-force participation rate both increase. (C) increases, and the labor-force participation rate is unaffected. (D) and the labor-force participation rate are both unaffected.

16. In an IS-LM model, if the governmentadopts a loose monetary policy and a tight fiscal policy simultaneously, (A) interest rate increases, while output stays the same. (B) interest rate stays the same, while output decrcases. (C) interest rate change is uncertain, while output increases. (D) interest rate decreases, while output changes is uncertain.

17. In a small open economy, a loose fiscal policy coupled with an increase in import tariff will cause domestic currency to (A) increase. (B) decrease. (C) remain the same. (D) change in an uncertain direction.

18. Assuming, in a two-period model, that the nominal wage rate increases from $10/hour to $15/hour； the expected price level increases from I to 3； and the actual price level increases from 4 to 5, we can deduce that (A) nominal wage rate decreases. (B) expected real wage rate increases. (C) actual real wage rate increases. (D) All of the above are correct. 

20. If the central bank announces a decrease in money supply while keeping the actual money supply unchanged, the rational expectations theory would predict (A) both output and price remain unchanged. (B) output increases, while price decreases. (C) output decreases, while price increases. (D) output remains unchanged, while price decreases. 

1.將力常數k的彈簧掛在天花板上,在其下方懸掛質量m的木塊。當木地達成平衡時,再將木塊下拉R距離後釋放,則木塊通過平衡點上方0.5R處的速率為(A)(B)(C)(D)(E)0

2.如圖所示,為一圓形山丘,A點為山丘的最高點,此圓形山丘的的曲率半徑為50m。今有一滑雪者要越過此山丘，假設空氣阻力及滑雪道的摩擦力皆可忽略不計，A點與B 點的高度差5m。若滑雪者由B點出發,通過A點時恰能水平飛出，則他在B點的速度應為多少? (g=10m/2) (A) (B) (C)(D)(E)

3.如圖所示,一均質質量m,長度為L的繩跨過光滑釘子兩邊對齊後放置,將A拉下少許 ,即A端漸漸滑下至B恰離開釘子時,繩的速度為何?(A)(B)(C)(D)(E)

4.如圖所示，A、B質量分別為3m、2m,則A正向彈性碰撞到靜止之B後 ,B恰能通過最高點,則碰撞後A球之速度值為(A)(B)(C)  (D)(E)

5. 質量為m的行星沿橢圓形軌道環繞太陽運動,已知此行星離太陽的最大距離與最小距離比為5:3； 若行星在近日點的速度為v0,則當行星由近日點移動到遠日點過程,太陽對行星的萬有引力作功多少 ? (A) (B) (C)(D)(E)