Asked by juanpro

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 )

Answered by Anonymous
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
Answered by Anonymous
Its incorrect
Answered by Anonymous
no it is correct
Answered by juanpro
in numbers 256.5 and 1.71 respectively?
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