I believe the answer is 5 Hz (swings/time)
Y = +1-3 = -2
X = -5+7 = +2
D = √2^2-2^2 = 2√1+1 = 2√2 km
Why does time seem to flow only in one direction? What happens in the gray zone between solid and liquid? Can we find a unified theory of physics?
Radiation transfers heat by electromagnetic waves
