New experiments predict that Ceres should be extensively contaminated with meteoritic debris derived from the asteroid belt. All types of impactors likely contribute to the contamination. Ceres may accrete debris more efficiently if it is ice-rich because of enhanced projectile survival and retention in porous ice targets. Experiments indicate that if a silicate regolith lag protects subsurface...

The paper gives two examples of simulating motion with spreadsheets, which are projectile motion in vacuum, and projectile motion in the air with quadratic drag.

Experimental values of N/Z equilibration were calculated by the method developed by A. Keksis [1]. The isobaric yield ratios for the A=3,6,7,11,14,16 isobars were calculated from reactions of Ca beams on Sn targets. These isobar yield ratios were then plotted individually versus the N/Z of the quasi-projectile (QP) for the four systems. The (N/Z)QP was assumed to be a straight mixing between th...

New analytical formulas for the electronic stopping power and the energy loss straggling of low velocity extended charge projectiles in the degenerate electron gas are calculated within the dielectric function method. The stopping and straggling effective charges Zeff of a projectile were analysed. They are found to differ one from the other and to depend on the electron gas density rs, on the ...

The rail gun is an electromagnetic device that converts electrical energy into mechanical energy for accelerating the projectile to hypervelocity. In order to accelerate the projectile between the conducting rails, it uses the magnetic field generated by the rail current. The rail gun consists of two parallel conductors called the rails that are bridged by a non-ferromagnetic conductor called a...

Traditional artillery guidance can significantly improve the attack accuracy and overall combat efficiency of projectiles, which makes it more adaptable to the information warfare of the future. Obviously, the accurate measurement of artillery spin rate, which has long been regarded as a daunting task, is the basis of precise guidance and control. Magnetoresistive (MR) sensors can be applied to...

the aim of this work is to find an efficient aerodynamic-based design algorithm for projectile fins and configuration shape optimization. three-dimensional supersonic flow over a projectile with fins at much number 5 and one degree angle of attack was studied. the runge-kutta method and multi-block technique was used to solve the governing equations. a basic configuration was assumed for the fi...

An explanation is offered of the morphology of the entry wound caused by a firearm projectile, of the projectile path through the body, and of the exit wound. Special consideration is given to pressure and shock waves caused and their relation to the speed of the projectile (below, equal to or superior to Mach1). The action of both pressure and shock waves is very significant, more so than ts a...

Our experiments and molecular dynamics simulations on a projectile penetrating a two-dimensional granular medium reveal that the mean deceleration of the projectile is constant and proportional to the impact velocity. Thus, the time taken for a projectile to decelerate to a stop is independent of its impact velocity. The simulations show that the probability distribution function of forces on g...