A rocket is fired vertically in a vacuum (free space where the gravitational field is negligible).During the burning process, the exhaust gases are ejected at a constant rate of 1000 kg/s and at a constant velocity with magnitude 400 m/s relative to the rocket.Let M be the total initial mass of the rocket, and assume the rocket starts motion from rest.In order to accelerate to the speed of 800 m/s, the rocket has to burn P % of the total initial mass M as a fuel. Assuming there is sufficient amount of fuel on board, the value of P is equal to:
A) 1 -
B) 100
C) 100
E) 100 -

Question

A rocket is fired vertically in a vacuum (free space where the  gravitational field is negligible).During the burning process, the exhaust gases are ejected at a constant rate of 1000 kg/s and at a constant velocity with magnitude 400 m/s relative to the rocket.Let M be the total initial mass of the rocket, and assume the rocket starts motion from rest.In order to accelerate to the speed of 800 m/s, the rocket has to burn P % of the total initial mass M as a fuel. Assuming there is sufficient amount of fuel on board, the value of P is equal to:
A) 1 - 
B) 100 
C) 100 
E) 100 -

Quizplus · Accepted Answer

The Answer of A rocket is fired vertically in a vacuum (free space where the  gravitational field is negligible).During the burning process, the exhaust gases are ejected at a constant rate of 1000 kg/s and at a constant velocity with magnitude 400 m/s relative to the rocket.Let M be the total initial mass of the rocket, and assume the rocket starts motion from rest.In order to accelerate to the speed of 800 m/s, the rocket has to burn P % of the total initial mass M as a fuel. Assuming there is sufficient amount of fuel on board, the value of P is equal to:
A) 1 - 
B) 100 
C) 100 
E) 100 -

A Rocket Is Fired Vertically in a Vacuum (Free Space