Calculating Speed of Military Airplane at Mach 2.00

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Homework Help Overview

The discussion revolves around calculating the speed of a military airplane traveling at Mach 2.00, specifically at sea level and at 0 degrees Celsius. The original poster presents an equation relating Mach number to speed but expresses uncertainty about their calculations and the expected answer.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the relationship between Mach number and the speed of sound, with the original poster attempting to calculate speed based on their understanding of the equation. Some participants question the relevance of density in this context and whether it should be considered in the calculations.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the Mach number equation, but there is no explicit consensus on how to proceed with the calculations or the assumptions involved.

Contextual Notes

There is mention of the speed of sound varying with conditions such as density, which may impact the calculations. The original poster expresses concern that their teacher may not expect this factor to be included in the solution.

soulja101
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Homework Statement


A military airplane can travel at mach 2.00 What is the speed in km/h at sea level and at 0 degress

Homework Equations


mach number=speed of object/speed of sound

The Attempt at a Solution


speed of object=speed of sound divided by mach number
322meters per second/2.00
=166m/s that's answer i got for the 0 degrees but its wrong because the answer is supposed 2390km/h i don't know how to get the sea level one.
 
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The speed of sound changes with density. It travels faster under water for instance.
 
wat do u mean

so i can get the answer i don't think the teacher wanted us to the density thing, is there another way of doing this
 
mach number=speed of object/speed of sound

Correct.

speed of object=speed of sound divided by mach number

Try again. If the speed limit sign says "30 miles per hour" and the officer says "I just clocked you at twice the posted limit", does that mean you were going 15 mph or 60?
 
Last edited:

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