Cho mạch điện như hình, biết R1=7Ω, R2=12Ω, R3=4Ω, điện trở của các dây nối không đáng kể, hiệu điện thế giữa hai đầu đoạn mạch là 12V. Hãy tính: a/Điện trở tương đương của đoạn mạch
b/ Cường độ dòng điện qua mỗi điện trở

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Which bonds are found inside a water molecule

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.