A rocket with an initial mass of 1000 kg adjusts its thrust by ...

[MGLQZ]

A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80 of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
 a. 0.40 kg/s
  b. 0.50 kg/s
  c. 0.60 kg/s
  d. 0.70 kg/s
  e. 0.80 kg/s

Question 2

A saturated hydrocarbon that is made up of eight
  carbon atoms and eighteen hydrogen atoms is
  named
  a) octane.
  b) butane.
  c) methane.
  d) ethane.

[tsternbergh47]

Answer to Question 1

a

Answer to Question 2

a

[MGLQZ]

Excellent

[6ana001]

Gracias!