How much force would be generated by two charged objects held 2 m apart, if 91 has a charge of 3.0 C and 92 has a charge of 4.0 C? K is the constant of
proportionality

A. 6K Newton
B. 3k Newton
C. .5k Newton
D. 1.5k Newton

Oxygen gas enters well-insulated diffuser at 25 lbf/in.2, 420r, with a velocity of 860 ft/s through a flow area of 1.6 in.^2. at the exit, the flow area is 12 times the inlet area, and the velocity is 19 ft/s. the potential energy change from inlet to exit is negligible. assuming ideal gas behavior for the oxygen and steady-state operation of the diffuser, determine the following: (a) the exit temperature, in r(b) the exit pressure, in lbf/in.^2 (c) the mass flow rate, in lb/s