Tham khảo tài liệu 'physics_test_bank_split_5', 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 55. A 5-kg concrete block is lowered with a downward acceleration of m s2 by means of a rope. The force of the block on the rope is A. 14N up B. 14 N down C. 35 N up D. 35 N down E. 49N up ans D 56. A 90-kg man stands in an elevator that is moving up at a constant speed of s. The force exerted by him on the floor is about A. zero B. 90 N C. 880N D. 450N E. 49 N ans C 57. A 90-kg man stands in an elevator that has a downward acceleration of m s2. The force exerted by him on the floor is about A. zero B. 90N C. 760N D. 880N E. 1010 N ans C 58. A 5-kg concrete block is lowered with a downward acceleration of m s2 by means of a rope. The force of the block on Earth is A. 14N up B. 14 N down C. 35 N up D. 35 N down E. 49 N up ans E Chapter 5 FORCE AND MOTION I 61 Simpo PDF Merge and Split Unregistered Version - http 59. Two blocks are connected by a string and pulley as shown. Assuming that the string and pulley are massless the magnitude of the acceleration of each block is A. s2 B. s2 C. m s2 D. s2 E. s2 ans E 60. A 70-N block and a 35-N block are connected by a string as shown. If the pulley is massless and the surface is frictionless the magnitude of the acceleration of the 35-N block is A. s2 B. s2 C. s2 D. s2 E. s2 ans B 62 Chapter 5 FORCE AND MOTION I Simpo PDF Merge and Split Unregistered Version - http 61. A 13-N weight and a 12-N weight are connected by a massless string over a massless frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times A. 1 B. 1 12 C. 1 13 D. 1 25 E. 13 25 ans D 62. A massless rope passes over a massless pulley suspended from the ceiling. A 4-kg block is attached to one end and a 5-kg block is attached to the other end. The acceleration of the 5-kg block is A. g 4 B. 5g 9 C. 4g 9 D. g 5 E. g 9
