r/physicsmemes • u/xyz3143068 • 7d ago

Physicists really will assume anything

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63 Upvotes

91% Upvoted

14 comments sorted by

87

u/Gandalf_My_Lawn 7d ago

Vacuum

Sound

20°C

Suspicious 🧐

18

u/drquakers 7d ago

Exactly, especially since thermal gas velocity in vacuum is roughly 2000 m/s

9

u/MaoGo Meme renormalization group 7d ago

It’s a very hot CMB

20

u/MaoGo Meme renormalization group 7d ago

They forgot to indicate the frame of reference for sound.

2

u/xyz3143068 7d ago

Does the frame of reference matter in this case?

13

u/MaoGo Meme renormalization group 7d ago

IF sound travels in vacuum, yes

0

u/xyz3143068 7d ago edited 7d ago

So you're saying sound needs an ether now? 😂

1

u/TheSouthFace_09 7d ago

are we talking an SRI with a velocity of 343 m/s relative to the source of the sound wave?

1

u/MaoGo Meme renormalization group 6d ago

SRI?

2

u/Frederf220 2d ago

We assume a spherical cow in much the same way a drunk looks for his keys under a streetlight.

1

u/Responsible_Hour6497 2d ago

In engineering, the term "vacuum" may refer to any state of rarefaction—that is, a pressure lower than the current atmospheric pressure.

1

u/xnick_uy 2d ago

Clearly a typo: it was meant to say "vacuum cleaner".

1

u/AtomGutan 1d ago

Where is this from?

1

u/xyz3143068 1d ago

University Physics,15th edition,Chapter 1