Tham khảo tài liệu 'physics_test_bank_split_10', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http 65. A 3-g bullet is fired horizontally into a 10-kg block of wood suspended by a rope from the ceiling. The block swings in an arc rising 3 mm above its lowest position. The velocity of the bullet was A. unknown since the heat generated in the collision was not given B. X 102 m s C. s D. s E. X 104 m s ans B 66. A and a cart approach each other on a horizontal air track. They collide and stick together. After the collision their total kinetic energy is 40 J. The speed of their center of mass is A. zero B. s C. s D. s E. s ans C 67. Blocks A and B are moving toward each other. A has a mass of kg and a velocity of 50m s while B has a mass of kg and a velocity of 25m s. They suffer a completely inelastic collision. The kinetic energy lost during the collision is A. 0 B. 1250 J C. 3750J D. 5000 J E. 5600 J ans C 68. For a completely inelastic two-body collision the kinetic energy retained by the objects is the same as A. the total kinetic energy before the collision B. the difference in the kinetic energies of the objects before the collision C. 2Mv2om where M is the total mass and vcom is the velocity of the center of mass D. the kinetic energy of the more massive body before the collision E. the kinetic energy of the less massive body before the collision ans C 69. A 75-kg man is riding in a 30-kg cart at m s. He jumps off in such a way as to land on the ground with no horizontal velocity. The resulting change in speed of the cart is A. zero B. s C. s D. m s E. m s ans D 136 Chapter 9 CENTER OF MASS AND LINEAR MOMENTUM Simpo PDF Merge and Split Unregistered Version - http 70. An elastic collision is one in which A. momentum is not conserved but kinetic energy is conserved B. total mass is not conserved but momentum is conserved C. kinetic energy and momentum are both conserved D. momentum is .
