Mass driver constrained by a limited amount of onboard spacecraft power. Thrust and momentum from exhaust, per unit mass expelled, scales up linearly with its velocity (momentum = mv), yet kinetic energy and energy input requirements scale up faster with velocity squared (kinetic energy = mv). Too low exhaust velocity would excessively increase propellant mass needed under the rocket equation, with too high a fraction of energy going into accelerating propellant not used yet. Higher exhaust velocity has both benefit and tradeoff, increasing propellant usage efficiency (more momentum per unit mass of propellant expelled) but decreasing thrust and the current rate of
Mercy Multiplied an audio bible featuring the voices of Christian celebrities and testimonies of Mercy Multiplied graduates. In spite of Mercy Multiplied principles of not accepting government funding and providing their program free of charge to their clients, Mercy Ministries Australia was investigated by the Australian Competition & Consumer Commission (ACCC) and found to be in breach of the Trade Practices Act 1997 and guilty of "false and misleading advertising" of their services, including advertising that their program was free of charge when their clients were in fact required to sign over their government welfare benefits. The former directors were required to