How can I calculate the joules for speeding objects?

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Discussion Overview

The discussion revolves around calculating the energy associated with moving objects, particularly in the context of an object traveling at a constant speed of Mach 7 over a distance of 20,000 feet, with a specified weight of 2,000 lbs. Participants explore various formulas related to kinetic energy and acceleration.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant introduces the scenario of an object moving at Mach 7 and seeks formulas for calculating energy related to accelerating objects.
  • Another participant provides the kinetic energy formula KE = 1/2mv², specifying the variables for mass and speed.
  • A participant points out that an object moving at a constant speed is not accelerating, prompting a clarification of the original question regarding general equations for accelerating objects.
  • A later post presents a more complex equation involving kinetic energy and additional terms, although the context and correctness of the formulation are not established.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the appropriate formulas for the scenario presented, and there is some confusion regarding the distinction between constant speed and acceleration.

Contextual Notes

The discussion includes assumptions about mass and speed conversions, as well as the implications of using different units (e.g., pounds to kilograms) that remain unresolved.

promeus
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Ok,lets say an object is moving at a constant speed of Mach 7 for 20000ft. The weight for the object is 2000 lbs.

What formulas could I use to calculate the energy for accelerating objects,or this one in particular?
 
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The formula for kinetic energy is KE = 1/2mv2.

m = mass, in kg
v = speed, in m/s

KE = kinetic energy, in joules
 
promeus said:
Ok,lets say an object is moving at a constant speed of Mach 7 for 20000ft. The weight for the object is 2000 lbs.

What formulas could I use to calculate the energy for accelerating objects,or this one in particular?
By the way, something moving at constant speed is not accelerating!
 
Thank you I just realized my error,but I was asking for general equations when I said "accelerating objects".
 
KE = .5m(v0^2) + mas = .5m(v0^2) + Fs = .5m(v0^2) + F(v0t + .5(a)(t^2)) ?
 

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