Abstract: An approximate expression is found for the penetration rate of a flexible penetrator, modeled as two masses joined by an elastic member with damping, with applied bias and harmonic forces. ...

Abstract: I extend the theory of dash running by allowing resisting force to be proportional to any positive power of speed and by allowing the runner to be tractive-force-limited at the beginning of ...

Abstract: A theory is developed to explain why racing shell crews use sliding seats and shorter-than-necessary stroke intervals, two features that tend to waste energy in a highly competitive, power-limited ...

Abstract: A perturbation technique based on small reciprocal of rotational inertia is used to find limit cycles for a system consisting of a spring, dashpot, and mass upon which is mounted an eccentric ...

Abstract: A fore-aft vibrating plow with applied harmonic and bias forces, and with soil-blade interaction modeled by a constant tip resistance in uncut soil and zero skin friction is studied analytically. ...