As shown in the figure of the quality of sixty kilograms of people standing in the quality of 30 kg of the basket he used to pull the rope with N pull in order to make And the basket remain in the air still
Physics Grade 8 Classroom Class? 225N The rope in his hand is N, and the rope on his right is the N-cow because of the pulley's pull, so the rope on the pulley connecting the two ropes is pulled at 2N, and the left side of the rope is the left Of the rope strength of 2N, so a total of 4N of force to bear 60kg × 10N kg +30 kg × 10 kg = 900 cattle, so: N = 900N ÷ 4 = 225N
in strict accordance with the requirements of the security program, so that the ground from the ground 3m (the first floor) set up a safe flat network, the construction layer of flat network protection, with the taste of Dan Dan citrus slurried mixed dead body construction layer, Under the construction layer every 10m set a flat network
strict materials into the factory, the safety net must be fully identified, a production license, product certification, the local safety supervision department issued by the quasi-license, unqualified safety net shall not be used for construction, use the old network to sample testing, Meet the requirements before use
