Abstract An exhaustive analysis of the leaky tank car problem is presented, pointing out its intriguing physical properties, which also well serve to students and teachers for illustrating standard Newtonian mechanics in a highly nonstandard fashion. Calculus effectively required only examine some details concerning solution equation motion interesting limiting cases, while we unveil all conten...

INTRODUCTION Pain, mood problems, and sleeping difficulties are often comorbid and contribute to reduced physical function and quality of life for those with chronic pain. However, the way in which these factors interact is unclear. Until recently it was thought that the effect of sleep on pain and physical function was simply a result of its common association with mood problems. However, a gr...