What is the maximum height of the rocket?

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SUMMARY

The maximum height of a rocket with a body mass of 0.49 kg and 1.47 kg of fuel, consuming fuel at a rate of 0.49 kg/s with an exhaust speed of 60 m/s, can be determined through thrust calculations and kinematic equations. The thrust produced by the rocket engine is calculated using the formula F = ṁ * v_e, where ṁ is the mass flow rate and v_e is the exhaust speed. After the fuel is exhausted, the rocket behaves as a projectile, allowing for the calculation of maximum height using kinematic equations.

PREREQUISITES
  • Understanding of Newton's Second Law of Motion
  • Familiarity with kinematic equations for projectile motion
  • Basic calculus for integrating functions
  • Knowledge of thrust calculation in rocketry
NEXT STEPS
  • Calculate thrust using the formula F = ṁ * v_e for the given parameters
  • Develop an expression for the rocket's mass as a function of time during fuel consumption
  • Integrate acceleration to find velocity and height functions over time
  • Analyze the projectile motion phase after fuel depletion to determine maximum height
USEFUL FOR

Students in physics or engineering, rocket scientists, and anyone interested in understanding the dynamics of rocket propulsion and projectile motion.

demenius
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Homework Statement


A rocket has a body which consists of 0.49kg of material. This body holds 1.47kg of fuel. The fuel is consumed at a rate of 0.49kg/s, and the exhaust speed of the fuel is 60m/s. Assuming that the rocket starts from rest, what is the maximum height the rocket reaches?


Homework Equations


Note: ∫ln(x)dx = xln(x) - x


The Attempt at a Solution


None. Don't know where to start.
 
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Start by determining the thrust (force) that the engine produces as it burns fuel at the given rate with the given exhaust speed. Then find an expression for the mass of the rocket+propellant with respect to time. With these you can write an expression for the acceleration of the rocket w.r.t. time (remember to include gravitational acceleration). With the acceleration function you can find velocity and distance with some calculus.

The rocket will have some height and speed when the fuel runs out, so it becomes a simple projectile after that.
 

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