Author Question: Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest ... (Read 40 times)

jace · **on:** Jul 28, 2018

Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest changes the final kinetic energy of the burnout stage by what factor? Assume all other variables, such as the mass of the rocket and the mass of the fuel, do not change.
a. It is the same.
b. It doubles.
c. It quadruples.
d. It increases by a factor of 1.693.

Question 2

At liftoff, the engines of the Saturn V rocket consumed 12 500 kg/s of fuel and exhausted the combustion products at 2 700 m/s. What was the total upward force (thrust) provided by the engines?
a. 3.38E+7 N
b. 4.63E+6 N
c. 2.16E+5 N
d. 3.48E+7 N
e. 3.28E+7 N