(2) Determine the angular acceleration of link BD.

3. [15 points] The beam AB has a negligible mass and thickness and is subjected to a triangular distributed loading. It is supported at one end by a pin and at the other end by a post having a mass of 50 kg and negligible thickness. Determine the two cocficients of static friction at B and at C so that when the magnitude of the applied force is increased to P = 150 N the post slips at both B and C simultaneously.

4. [20 points] The vertical position of the 100-kg block is adjusted by the screw-activated wedge. Calculate the moment M which must be applied to the handle of the screw to raise the block. The single-thread screw has square threads with a mean diamcter of 30 mm and advances 10 mm for cach complete turn. The coetficient of friction for the screw threads is 0.25, and the coefficient of friction for all mating surfaces of the block and wedge is 0.40. Neglect friction at the ball joint A.

5. [14 points] A ball of negligible size and mass m is given a velocity of vo on the center of the cart which has a mass M and is originally at rest. If the coeficient of restitution between the ball and walls A and B is e, determine the velocity of the ball and the cart just after the ball strikes A. Also, determine the total time needed for the ball to strike A, rebound, then strike B. and rebound and then return to the center of the cart. Neglect friction.

(1) Determine the angular velocities of links AB and BD for the position shown if the band has a spoed of 2 n/s.

1.昆蟲複眼分哪幾類?其像原理為何?繪圖說明之。(10%)

2.請繪圖說明螢火蟲發光器的發光機制以及神經系統如何控明減閃爍的發光行為。(10%)

3.Ecdysone及Juvenile hormone 各為何類的hormone?各由哪種gland 生?各有哪些生理功能?(10%)

4.請繪圖說明昆蟲觸角的分節(蝗蟲的絲狀、胡蜂的膝狀、蒼蠅的芒狀)。(10%)

5.請依附圖說明昆蟲的氣管系統。(10%)

6.請說明利用水生昆蟲作環境品質監測的優點。(5%)