https://www.rajpub.com/index.php/jap/issue/feed JOURNAL OF ADVANCES IN PHYSICS 2024-01-27T05:08:31+00:00 Editorial Office editor@rajpub.com Open Journal Systems https://www.rajpub.com/index.php/jap/article/view/9573 The Effect of the Earth’s Rotation and Gravity on the Speed of Light 2024-01-01T01:25:07+00:00 Miloš Čojanović mcojanovic@yahoo.com <p>Based on the results of the M ichelson ̆Morley experiment [1] and the direct measurement of the speed of light in two directions, we can conclude that the movement of the Earth in relation to the Sun and the movement of the solar system in relation to the center of the galaxy do not affect the measurement of the speed of light in the vicinity of the Earth. But on the other hand, based on results of the M ichelson ̆Morley experiment and the direct measurement of the speed of light in two directions we cannot know with certainty whether the Earth’s rotation around its axis affects the measurement of the speed of light in one direction. Thus, instead of the motion by which the Earth’s surface moves in relation to the Sun, we will observe the angular motion by which the Earth rotates on its axis relative to distant stars. Instead of measuring the speed of light in two directions, we will measure the speed of light in one</p> 2024-01-27T00:00:00+00:00 Copyright (c) 2024 Miloš Čojanović https://www.rajpub.com/index.php/jap/article/view/9561 Laser heating of a finite silver sulfide slab (Ag2S). An elegant analytical solution using Laplace integral transform method. 2023-12-09T12:08:58+00:00 M.K.El Adawi adawish1@hotmail.com S.A. Shalaby adawish1@hotmail.com S.S. Mostafa adawish1@hotmail.com S.A. Antar adawish1@hotmail.com <p><span style="font-weight: 400;">The problem of heating a finite silver sulfide slab with cw laser is studied using Laplace integral transform technique. For a certain laser power irradiance an expression for the temperature profile within the slab is obtained. The temperature variations with time for the front and rear surfaces are also obtained. The critical time required to initiate melting can thus be computed. Computations for an illustrative example are given. The obtained results reveal.</span></p> 2024-01-27T00:00:00+00:00 Copyright (c) 2024 M.K.El Adawi, S.A. Shalaby, S.S. Mostafa, S.A. Antar