Một máy bơm điện hoạt động với hiệu suất 70%,
bơm nước lên tầng cao
trong hộ gia đình với dòng
điện 10A. Giả sử ma sát
làm tiêu hao 15% công suất
của động cơ và phần công
suất hao phí còn lại là do
hiệu ứng Jun-Lenxơ. Tính
điện trở của động cơ máy
bơm. Biết máy bơm sử
dụng mạng điện quốc gia

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?