The Doppler method can be used to estimate the semimajor axis of a planet's orbit by: a. measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law.
b. measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity.
c. measuring the amount by which the starlight is reduced when the planet transits.
d. measuring the asymmetries in the velocity curve.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

an energy transformation flow diagram is shown

where is it ?

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

total distance/total time

(85 + 82)/(5+3)

167/8

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