Energy lost from sphere due to spark

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SUMMARY

The discussion centers on calculating the energy lost from a sphere due to a spark, specifically using the formula for kinetic energy. The user initially calculated the energy loss as 0.143 J but later corrected it to 0.152 J after realizing a misreading of the values. The correct approach involves using the formula 1/2 * mass * velocity squared for both the initial and final states, leading to the conclusion that careful attention to detail in reading values is crucial for accurate calculations.

PREREQUISITES
  • Understanding of kinetic energy formula: KE = 1/2 mv²
  • Basic algebra for manipulating equations
  • Familiarity with scientific notation
  • Ability to interpret physical quantities in a problem context
NEXT STEPS
  • Review the principles of energy conservation in physics
  • Practice problems involving kinetic energy calculations
  • Explore common pitfalls in reading and interpreting data
  • Learn about the significance of significant figures in scientific calculations
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Students studying physics, particularly those focusing on mechanics and energy concepts, as well as educators looking for examples of common calculation errors in energy problems.

Janiceleong26
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1. Homework Statement

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Homework Equations

The Attempt at a Solution


I did this :
1/2 (2.7x10^-6)(150x10^3) - 1/2 (1.575x 10^-6)(75x10^3) =0.143 J
But the answer is 0.15 , where did I did wrong?
 
Last edited:
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I think it is: [(1/2) x (2.7x150) - (1/2) x (1.35x75)]x10^-3 = 0.152 J
 
freddie_mclair said:
I think it is: [(1/2) x (2.7x150) - (1/2) x (1.35x75)]x10^-3 = 0.152 J
Oh whoops, I read off the point wrongly, thanks!
 

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