What should be the spring constant k of a spring designed to bring a 1200-kg car to rest from a speed of 94 km/h so that the occupants undergo a maximum acceleration of 4. 0g?.

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?