Finding PE given mass, distance, and energy lost.

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SUMMARY

The discussion focuses on calculating the potential energy (PE) of a vehicle with a mass of 4000 kg that travels 800 m, losing 75% of its energy to heat and friction. The relevant equation for potential energy is PE = mgh, where 'm' is mass, 'g' is the acceleration due to gravity (9.8 m/s²), and 'h' is height. The user expresses frustration over insufficient information to derive a numerical answer, highlighting the need for additional variables, such as height or speed at the end of the distance traveled, to complete the calculation.

PREREQUISITES
  • Understanding of potential energy (PE) and its formula: PE = mgh
  • Basic knowledge of physics concepts including mass, distance, and energy loss
  • Familiarity with gravitational acceleration (9.8 m/s²)
  • Ability to manipulate algebraic equations for problem-solving
NEXT STEPS
  • Research how to calculate height (h) when given mass and energy loss
  • Learn about energy conservation principles in physics
  • Explore the relationship between potential energy and kinetic energy
  • Investigate the effects of friction and heat on energy calculations
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding energy calculations in mechanical systems, particularly in scenarios involving energy loss due to friction and heat.

Adam Affagal
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Homework Statement


I'm supposed to find the potential energy at the start of a system for a vehicle given that the mass is 4000kg, the total distance traveled is 800m, and 3/4 of the total energy is lost to heat and friction by the end of the distance traveled (it's assumed that the vehicle starts from rest). Now, I know I can easily solve for a variable, but given this information I'm under the impression that I need to get a numerical answer. It's frustrating because I feel like I am not taking something into account.

Homework Equations


PE = mgh

The Attempt at a Solution


I've come up with really just substitution for the variables, so:
PE = 4500kg*9.8m/s^2*h.
 
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Is that all of the information that you have been given? It's not enough.
 
jbriggs444 said:
Is that all of the information that you have been given? It's not enough.
Unfortunately, yes. I have scoured over my worksheet - nothing. I've since emailed my professor, but any further input you guys have would be appreciated.
 
You could try finding a formula for potential energy in terms of some other variable. For instance, as a function of speed at the end of the run.
 

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