The resistance R1 is 40 ohm, R2 is 60 ohm, the two are in parallel, the voltage at both ends is 120 v. calculate (1) the total resistance; (2) the current of each resistance; (3) the total current
(1) R = r1r2 / (R1 + R2) = 40 * 60 / (40 + 60) = 24 ohm
(2)I1=U/R1=120/40=3A
I2=U/R2=120/60=2A
(3) I total = I1 + I2 = 3 + 2 = 5A
Buoyancy formula?
F = row G
F = density of water * GV
F floating = f upward pressure - f downward pressure
When an object floats or floats, f = G
When the object sinks to the bottom, f floats = g object-n
What is the balance method of buoyancy calculation?