Consider a rocket in space that ejects burned fuel at a speed of 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant).

Question

Consider a rocket in space that ejects burned fuel at a speed of    1.5  km/s with respect to the rocket. The rocket burns 9  % of its mass in 310  s (assume the burn rate is constant).

(a) What is the speed   of the rocket after a burn time of 155.0 s? (suppose that the rocket starts at rest; and enter your answer in m/s)

unanswered

(b) What is the instantaneous acceleration   of the rocket at time 155.0 s after the start of the engines?(in m/s   )

Anonymous · Answer

p: percentage (4.5% is burned in 155s) m:mass of rocket u:fuelspeed in meter/s! v=u*ln(1/(1-p))=1500*ln(1/0.955) a=v/t

Anonymous · Answer

Its incorrect

Anonymous · Answer

no it is correct

juanpro · Answer

in numbers 256.5 and 1.71 respectively?