Finding the Magnitude of Force without Time: A Rocket Pack Dilemma

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SUMMARY

The discussion centers on calculating the magnitude of force exerted by a rocket pack on Pam, who has a mass of 45 kg and accelerates to a speed of 62.5 m/s over a distance of 22.0 m on frictionless ice. The correct approach involves using the work-energy principle, specifically the equation W = ΔKE, where W represents work done and ΔKE is the change in kinetic energy. The user initially calculated the force as 441 N, which was incorrect, highlighting the importance of correctly applying the work-energy relationship to derive the force and kinetic energy values.

PREREQUISITES
  • Understanding of Newton's Second Law of Motion
  • Familiarity with the work-energy principle
  • Basic knowledge of kinetic energy calculations
  • Concept of frictionless surfaces in physics
NEXT STEPS
  • Study the work-energy theorem in detail
  • Learn how to derive force from work done using the formula W = F * d
  • Explore the relationship between force, mass, and acceleration
  • Investigate the effects of air resistance on motion in physics
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, as well as educators looking for practical examples of force and energy calculations.

amcoolio
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Hello all. Great site here. I have been working on this problem for a while now and I cannot figure out the magnitude of the force.

Pam, wearing a rocket pack, stands on frictionless ice. She has a mass of 45 kg. The rocket supplies a constant force for 22.0 m, and Pam acquires a speed of 62.5 m/s. Unless otherwise directed, assume that air resistance is negligible. What is the magnitude of the force? What is Pam's final Kinetic Energy?

How do you figure out the force when time is not a given? I have tried 441 N but it is wrong. (This is internet homework and I have used up 2 submissions. I have 8 submissions left.)
 
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How much kinetic energy does Pam have at the start, when she's motionless?

How much kinetic energy does Pam have at the end, when she's going 62.5 m/s?

How are work and force related?

- Warren
 
lol I am sooo stupid...I forgot about W=chgKE

thanks
 

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