Hạt mang điện giống nhau có cùng khối lượng m= 3.10⁻²⁷kg, điện tích q=5.10⁻¹⁰C,đặt trong nước nguyên chất (ε = 1 ). Lực đẩy cu-lông lớn hơn lực hấp dẫn bao nhiêu lần? Biết rằng hằng số hấp dẫn là G=6,67.10⁻¹¹

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?