A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second?

balhigh

1 year ago

Remember Jet and rocket propulsion
Thrust(Force) = mass × velocity
270 = mass × 300
mass = 270÷300
mass = 0.90kg
C

Oyiza24

2 years ago

Thrust= force × time
But force and time are not given so we go further
force = mass × acceleration (remember your ×TIME
acceleration = mass × change in velocity /time
therefore (just like in dimension)
thrust becomes
thrust = mass×change in velocity×time /time
270= mass× 300-0 × time /time

time will cancel time
then making mass the subject of formula
mass = 270/300
mass= 0.90kg

patxi

6 years ago

No full evidence

Oyiza24

2 years ago

Thrust= force × time
But force and time are not given so we go further
force = mass × acceleration (remember your ×TIME
acceleration = mass × change in velocity
__________________________
time
therefore (just like in dimension)
thrust becomes
thrust = mass × change in velocity × time
________________________. ___
time. 1
270= mass× 300-0 × time
____________. ____
time. 1


time will cancel time
then making mass subject of formula
mass = 270
_____
300
mass= 0.90kg

Abby90

2 years ago

Simple and short
Thrust = mass x velocity
Therefore: mass = Thrust / velocity
Mass = 270 / 300
= 0.90