Physics 11 Net force and Acceleration

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SUMMARY

The discussion focuses on calculating the net force and acceleration of a Saturn rocket during launch. The rocket has a mass of 2.92x106 kg and a thrust of 3.34x107 N, resulting in a weight of 2.92x107 N and a net force of 4.2x106 N when it blasts off. The acceleration at launch is calculated to be 144 m/s2, and after 60 seconds, the rocket reaches a speed of 86.4 m/s. The discussion highlights that as fuel is consumed, the mass of the rocket decreases, leading to an increase in acceleration.

PREREQUISITES
  • Understanding of Newton's Second Law (F=ma)
  • Basic knowledge of gravitational force calculations (P.E. = mgh)
  • Familiarity with unit conversions in physics
  • Concept of thrust and its impact on acceleration
NEXT STEPS
  • Study the implications of changing mass on acceleration in rocket propulsion
  • Learn about thrust-to-weight ratio calculations in rocketry
  • Explore the principles of fuel consumption and its effects on rocket dynamics
  • Investigate advanced topics in kinematics and dynamics related to space travel
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and dynamics, as well as educators and anyone interested in the principles of rocket propulsion and motion.

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Homework Statement


g=10m/s^2
A fully loaded Saturn rocket has a mass of 2.92x10^6kg. Its engines have a thrust of 3.34x10^7N.

a) How much does the rocket weigh. answer 2.92x10^7 N
b) What is the net force on the rocket when it blasts off? answer 4.2x10^6N
c) What is the acceleration as it leaves the launch pad? 144m/s^2
d) What is its speed after 60 seconds? answer 86.4m/s
e) As the rocket moves away, the engine thrust is constant but the mass decreases - why? What effect does this have on acceleration. answer Fuel is consumed; m decreases, a increases.

Homework Equations



F=ma P.E. =mgh

The Attempt at a Solution


I have no idea how the answer for b) becomes 4.2x10^6N
Any help would be appreciated.
 
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Part c

Based on the question I got the mass as 2.92 and the thrust as 33.4. 33.4 to match the exponent for both numbers. The answer I got when F/m=a is 33.4kg by m/s^2/2.92Kg=11.4m/s^2m/s^2. This is obviously wrong. What am I doing wrong?
 

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