5) Consider a resistor of 502 in series with a pair of parallel resistors, one of which is known to be 262, the other is unknown. The equivalent resistance of all three is 27. What is the unknown resistor?

A 3.00-MΩ resistor and a 4.00-μF capacitor are connected in series with a power supply. 1)What is the time constant for the circuit? (Express your answer to three significant figures.)

6. An electrical circuit is shown below. The battery supplies 15 V. The resistances have the following values:   R₁= 30 Ω, R₂ = 40 Ω, R3 = 20 Ω .   (a) Calculate the replacement resistance of the three resistors.     (b) Calculate the total current through the circuit, and the current through the respective resistor     (c) If the lower right corner is grounded, then calculate the potentials at points A and B.   (d) If the current is interrupted at point C, what will be the potentials at A and B.

thanks!

#2 - For the previous problem, if the motor turns on when the voltage across it is 80% of the battery voltage, what is the ratio of the capacitor's charging time to its discharge time? 7.2 CORRECT R Vc Vo Motor 1.6 PC C 0.22 PC