the earth's structural zones (s-zones) are the lithosphere, asthenosphere, mesosphere, inner core, and outer core.
“without loss of generality, we only need to look at the equation for the x-position, since we know that centripetal acceleration points towards the center of the circle. thus, when θ = 0, the second derivative of x with respect to time must be the centripetal acceleration.
the first derivative of x with respect to time t is:
dx/dt = —rsinθ(dθ/dt)
the second derivative of x with respect to time t is:
d2x/dt2 = —rcosθ(dθ/dt)2—rsinθ(d2θ/dt2)
in both of the above equations the chain rule of calculus is used and by assumption θ is a function of time. therefore, θ can be differentiated with respect to time.
now, evaluate the second derivative at θ = 0.
d2x/dt2 = —r(dθ/dt)2
the term dθ/dt is usually called the angular velocity, which is the rate of change of the angle θ. it has units of radians/second.
for convenience we can set w ≡ dθ/dt.
d2x/dt2 = —rw2
this is the well-known form for the centripetal acceleration equation.”
the answer to your question is high voltage and high currency