Calculating Weight Savings of Aluminum Engine vs Cast Iron

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SUMMARY

The discussion focuses on calculating the weight savings of an aluminum engine compared to a cast iron engine, specifically for a typical automobile engine weighing 100 kg. Participants confirm that the approach involves calculating the volume of the cast iron engine using its density of 7.86 g/cm³, then applying that volume to determine the mass of the aluminum engine using its density of 2.70 g/cm³. The final step is to compute the difference in mass between the two materials to find the weight savings. This method is straightforward and relies on basic principles of density and volume.

PREREQUISITES
  • Understanding of density and its formula (Density = Mass/Volume)
  • Basic knowledge of unit conversions (grams to kilograms)
  • Familiarity with the properties of materials (specifically aluminum and cast iron)
  • Introductory physics concepts related to mass and volume
NEXT STEPS
  • Calculate the volume of a cast iron engine using the formula: Volume = Mass/Density
  • Determine the mass of an aluminum engine using the same volume and its density of 2.70 g/cm³
  • Explore the implications of weight savings on automotive performance and efficiency
  • Research the benefits of using aluminum in automotive manufacturing
USEFUL FOR

Automotive engineers, materials scientists, and students studying physics or engineering who are interested in material properties and their impact on vehicle design.

Suoh
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I've never taken physics, and I'm not even sure this is physics. :S On the hint it mentions, think of freshmen physics, but I honestly have no clue. Could someone help me out on how to even start this problem?

Estimate the weight savings if a typical automobile engine (100 kg) is made of aluminum instead of cast iron. Assume the total volume required is the same. (The density of iron is 7.86 g/cm3, the density of aluminum is 2.70 g/cm3).

I want to say that, if the engine is made of iron to start and typically weighs 100kg, then i calculate the volume using density and mass given. Afterwords, you'd find the mass for aluminum using the same volume as cast iron, like the problem states, and it's density. Then just calculate the difference between the two masses. I'm not sure though. :S I'm so confused, so if that didn't make sense, I'm sorry. ~.~

Any help is appreciated, thanks.
 
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Sounds right to me. Why the hesitation?
 

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