Gradients of rg and physical causes of gravity
     Figure 7 shows a laboratory at rest in the qm one Earth radius away from a massive body of one Earth mass. The laboratory is 300 ma or 10-6 LS high as shown. The bottom of the lab is =.021266 LS from the massive body and the top of the lab is =.021266+10-6 LS from the massive body. Therefore, a gradient of rg exists in the lab. Using Eq. (33) and the above values for , , m, and G,  rg at the bottom of the lab is =.9999999993054359 and rg at the top of the lab is =.9999999993054685. Throughout the lab, energy is being exchanged between and within the atoms comprising the lab. Due to the gradient of rg between the bottom and top of the lab, the energy exchange in the lab is unbalanced. An atom at the bottom of the lab emits photons having a lower frequency and energy than the photons it would emit were it at the top of the lab.
     This energy exchange imbalance throughout the lab along lines to the massive body will be represented by the imbalance in the energy exchanged between an atom at the bottom of the lab and an atom of the same element at the top of the lab. The energy of a photon emitted by an atom is a function of the emission frequency and Planck constant as specified by Eq. (22). The emission frequencies of the photons emitted at the bottom and top of the lab in Fig. 7 are reduced in proportion to the physical change ratios, and because all processes are slowed in proportion to rg. Therefore, the energy exchange imbalance (deg) caused by the gradient of rg between the bottom and top of the lab is as follows.
       (35)
By substituting the above values of and into Eq. (35) the energy exchange imbalance due to the gradient of rg is deg=h·f·3.26·10-14 joules. The energy exchange imbalance throughout the lab results in a net force toward the massive body because the lab's atoms absorb more energy moving downward than energy moving upward.
     As shown in Fig. 7, rocket engines exert a force on the lab which keeps the lab from accelerating toward the massive body. Without this force, the lab will have an acceleration of 9.8 ma/sa2 or 3.26·10-8 ca/sa toward the massive body. This is the acceleration of a stone falling to Earth, and it is the acceleration, a, via Eqs. (1) and (2) if we let m1 be the stone's mass and m2 be Earth's mass so that a= F/m1= m2·G/2 = 5.98·1024·2.47·10-36/.0212662.


(Note: The cause of gravity described above is the gradient in the qm around a massive body where the speed of light is slower nearer the massive body. A "gravitational force" per se is unnecessary, and the number of fundamental forces needed to describe nature is reduced to three.)

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