Calculating Jet Engine Thrust: How to Use Newton's Second Law

[chrishere?]

Homework Statement

A jet engine gets it thrust by taking in air, heating and compressing it, and then ejecting it at a high speed. IF a particular engine takes in 20 k/g of air per second at 100 m/s and ejects it at 500 m/s calculate the thrust of the engine.
chriss #getmoney: thrust of the engine would be v right?

Homework Equations

i believe that the equation is Mv1 + Mv2 = V(Mv1+Mv2) and that the thrust = V .

The Attempt at a Solution

 

[Hootenanny]

Thrust is a force rather than velocity.

Hint: Try using Newton's Second Law.

Edit: The equation that you have written doesn't make sense, it simplifies to V=1 for all M and v.

 

[tiny-tim]

Welcome to PF!

A jet engine gets it thrust by taking in air, heating and compressing it, and then ejecting it at a high speed. IF a particular engine takes in 20 k/g of air per second at 100 m/s and ejects it at 500 m/s calculate the thrust of the engine.
chriss #getmoney: thrust of the engine would be v right?
…
i believe that the equation is Mv1 + Mv2 = V(Mv1+Mv2) and that the thrust = V .

Hi chrishere?! Welcome to PF!

Thrust is a force, so use Newton's second law in the form force = rate of change of momentum.

How much momentum is being ejected?