8.8 calculate the propellant mass required to launch a 2000-kg spacecraft from a 180-km-altitude circular earth orbit on a hohmann transfer trajectory to the orbit of saturn. calculate the time required for the mission and compare it with that of cassini. assume the propulsion system has a specific impulse of 300 s. {ans.: 6.03 yr; 21,810 kg}

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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measure their densities same density, same sub