Chicxulub. It's the most famous cataclysm ever, the meteorite that probably snuffed out the dinosaurs (along with three-quarters of all life on Earth) when it smashed into our planet 65 million years ago. The crater it left behind is actually one of the youngest and most accessible in the solar system.
The astronaut when positioned on a scale of an international space station that is static in rotational motion, and turning around the earth, will have no effect, since there is no external force acting on it. This is in perpetual free fall around the earth.
When an astronaut stands on a scale within a rotating space station, he will have the Rotational Centripetal Force acting on it, said Force, from the inside acting as 'Artificial Gravity' which will generate a given measurement on the scale.
Neutrons and protons floating in the air
if it takes 1 second to move from x to y. You haven't specified if x and y are extreme point or x is extreme and y is equilibrium point
I.If both are extreme points the period is T=1*2=2s
f(frequency)=2π/T(period)
f=6.28/2=3.14Hz
II.If x is an extreme point and y is equilibrium
T=4*1=4s
f=6.28/4=1.57Hz
