.Người ta mạ kẽm với dung dịch ZnSO4. Cường độ dòng điện qua bình điện phân là 110 A. Tính thời gian cần thiết để giải phóng 1 kg kẽm. Cho biết AZn = 65,4g/mol, hóa trị n=2

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?