I need solve this assignment

A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.5 m/s2. (a) If the tension in the cord is 82 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.5 m/s? (a) Number i Units Q4 (b) Number i Units Current Attempt in Progress In the figure here three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The masses are ma = 27 kg. mg = 40 kg, and mc = 14 kg. When the assembly is released from rest, (a) what is the tension in the cord connecting B and C, and (b) how far does A move in the first 0.300 s (assuming it does not reach the pulley)? Assume the table surface frictionless. B c (a) Number i Unit Q5 (b) Number i Unit Current Attempt in Progress The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m, = 1.6 kg; block 2 has mass m2 = 2.8 kg. What are (a) the magnitude of the blocks' acceleration and (b) the tension in the cord? Q6 (a) Number Units (b) Number Units