منابع مشابه
How to catch a cricket ball.
A cricket or baseball fielder can run so as to arrive at just the right place at just the right time to catch a ball. It is shown that if the fielder runs so that d2(tan alpha)/dt2 = 0, where alpha is the angle of elevation of gaze from fielder to ball, then the ball will generally be intercepted before it hits the ground. This is true whatever the aerodynamic drag experienced by the ball. The ...
متن کاملPostpsychiatry: how to throw out the baby with the bathwater.
Postpsychiatry is of comparatively recent origin. The term 'postpsychiatry' was coined by Campbell, in 1996 (Campbell 1996). It does not indicate psychiatry that comes after psychiatry. The term itself comes from postmodernism. The same as modern-day psychiatry is psychiatry of modern times, postpsychiatry is supposed to be psychiatry of the postmodern era. to name but a few, propagate the same...
متن کاملA Class of Nonpositively Curved Kähler Manifolds Biholomorphic to the Unit Ball in C
Let (M, g) be a simply connected complete Kähler manifold with nonpositive sectional curvature. Assume that g has constant negative holomorphic sectional curvature outside a compact set. We prove that M is then biholomorphic to the unit ball in Cn, where dimCM = n. Résumé. Soit (M, g) une variété kählérienne complète et simplement connexe à courbure sectionnelle non-positive. Supposons que g ai...
متن کاملHow a curved elastic strip opens.
An elastic strip is transversely clamped in a curved frame. The induced curvature decreases as the strip opens and connects to its flat natural shape. Various ribbon profiles are measured and the scaling law for the opening length validates a description where the in-plane stretching gradually relaxes the bending stress. An analytical model of the strip profile is proposed and a quantitative ag...
متن کاملFree-throw accuracy and success as a function of ball weight in 9- to 11-year-old male players
The goal of this study was to analyze whether 9-11 years old children can attain more free-throw accuracy and success by modifying the ball weight in basketball game. The participants were 54 children (age: mean=10.63, SD=0.55 years) from six basketball teams. The participants played four games with each of the following balls: (a) standard ball weight (485 g, 69-71 cm), (b) a lighter ball (440...
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ژورنال
عنوان ژورنال: Science
سال: 1911
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.34.885.844-a