Question

QUESTION 1 A uniform bar of total mass m and total length L has been bent into an L-shape such that the shorter segment is 1/4 of the total length. The free end of the longer segment is connected to a fixed frame with a frictionless revolute joint at A and the rod is initially held stationary with the longer segment horizontal and the shorter segment vertical as shown in the figure below. 3L 4 4 The horizontal distance from A to the center of mass is: 32 16 O c. None of the other answers are correct o d. 15 32 QUESTION 2 The vertical distance from A to the center of mass is: Oa. None of the other answers are correct 32 (#)L 4 QUESTION 3 The mass moment of inertia with respect to the mass center is: aNone of the other answers are correct ■b/ 87 mL 2048 ■ c. , 101 1536 mL d.203 mL 6184 QUESTION 4 The mass moment of inertia with respect to the revolute joint axis through A is 48 None of the other answers are correct .9 64 mL 192 QUESTION 5 Which of the following statements is correct? a. The mass moment of inertia with respect to A is equal to the mass moment of inertia with respect to the mass O . The mass moment of inertia with respect to A is larger than the mass moment of inertia with respect to the . C. The mass moment of inertia with respect to A is smaller than the mass moment of inertia with respect to the center mass center. mass center. QUESTION 6 At the instant the L-shaped bar is released from rest, the angular acceleration of the bar is 1)2 11 )L C. None of the other answers are correct ● d. ( 180) g 29 L QUESTION 7 The horizontal force exerted on the bar by the frame at the moment of release is: None of the other answers are correct QUESTION 8 The horizontal force at the moment of release is to the right. True O False QUESTION 9 The vertical force exerted on the bar by the frame at the moment of release is: a. 41 mg 176 b None of the other answers are correct mg 176 QUESTION 10 The vertical force at the moment of release is upward. O True ● False

Answer 1

8 Name +he bendin oint and frea end as B and 3L 3 2 2- 3 2

3 L 3 L. t(М.О.,. oķ short portion about Жс.о.м 2 4 4- 32. く,2 32- 81나 lo 2. 4 /024 с-о-м. 4 1024千1024 22 mL2 68 40g 6 4-03 6 rn 4-03 6 X 3 8o8 5 3 6

I5 L 2. 3 2 3 2 O 24 22 L 10 24- 5 3 6 808 ml." 12x226 mL 4-636x3 2. 55 mL ·、) at the moment baris relea fed -tor?ac eratedabo A 3 2 3 2 2 木- T8 55 L2