By Frank W K Firk
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Example text
We begin by noting one of the 41 standard results of Classical (Newtonian) Physics, namely, the expression for the kinetic energy (energy of motion), E, of an object of mass m, moving with a velocity v: E = (1/2)mv2. (A result derived in standard texts on Mechanics). We note that the ratio, energy/mass is E/m =(1/2)v2, (the ratio is proportional to (velocity)2). We are therefore led to study the ratio: gamma-ray energy/electron mass, to obtain the resulting velocity-squared. 8186 x 10-13 Joule.
The 3rd. Law applies to “contact interactions”. For non-contact interactions, it is necessary to introduce the concept of a “field-of-force” that “carries the interaction”. We note that in the 2nd. law, the acceleration lasts only while the applied force lasts. The applied force need not, however, be constant in time; the law is true at all instants during the motion. We can show this explicitly by writing: 33 F(t) = ma(t) where the time-dependence of the force, and the resulting acceleration, is emphasized.
Suppose that two similar clocks, 1 and 2, are attached to the rocket with 1 at the rear end and 2 at the nose of 45 the rocket. The clocks are separated by a distance l. We can choose two light sources, each with well-defined frequency, f0, as suitable clocks. f0 is the frequency when the rocket is at rest in an inertial frame in free space. F (an inertial frame, no gravitational field) y 2 constant acceleration, a, relative to F Clocks at rest in rocket l 1 Pulse of light emitted from 1 at t = 0 acceleration begins at t ≥ 0 x Let a pulse of light be emitted from the lower clock, 1, at time t = 0, when the rocket is instantaneously at rest in F.