What is "c" in E=mc^2?

thermodynamic free energy
specific heat capacity
speed of light
Coulomb, unit of the electric charge
In words, energy equals mass multiplied by the speed of light squared.
Paweł Kołodziejczyk
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Very interesting!
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Answers by country

thermodynamic free energy
specific heat capacity
speed of light
Coulomb, unit of the electric charge
answers
flagthe Netherlands
0%
0%
100%
0%
23
flagFrance
7%
0%
92%
0%
14
flagRepublic of Ireland
7%
0%
92%
0%
13
flagSingapore
0%
8%
91%
0%
12
flagGreece
3%
3%
84%
7%
26
flagSouth Africa
20%
0%
80%
0%
10
flagAustralia
7%
7%
77%
2%
40
flagMalaysia
5%
5%
77%
11%
18
flagSwitzerland
8%
5%
76%
2%
34
flagCanada
10%
13%
76%
0%
30
flagthe United States
8%
7%
75%
5%
230
flagthe United Kingdom
14%
4%
74%
6%
125
flagIndia
8%
9%
72%
7%
350
flagSpain
7%
0%
71%
7%
14
flagGermany
12%
6%
70%
7%
405
flagAustria
16%
2%
69%
6%
72
flagPoland
10%
13%
68%
6%
9294
flagPakistan
23%
3%
63%
6%
30
flagthe Philippines
13%
10%
51%
24%
29
flagNigeria
21%
0%
50%
28%
14