Cho mạch điện có: R1 = 20 Ohm; R2=R3 = 10 Ohm f = 60 Hz; L1 = L2 = 0,3 H; L3 = 0,1 H; C1=C2=C3 = 0,01 F
Tính giá trị các tổng trở Z1, Z2, Z3

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .