What is the maximum amount of charge that can be placed on a capacitor before dry air will electrically break down and the capacitor short-circuit? this occurs when the electric field between the plates exceeds about 3.0\times10^6 \space v/m3.0×10 6 v/m. assume each plate of the capacitor has an area of 6.8 \space cm^26.8 cm 2 . report your answer in units of 'nc' (nanocoulombs).

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.