[4] The radius of the base of a right cone is inches and the altitude of the cone is inches. Find the greatest parabolic section of the cone in square inches. 2019.03.05記 [4]底面の半径がインチ、高さがインチの直円錐がある。放物線の切り口の…

[3] Find the point of inflexion in the curve and determine the curvature at the origin. 2019.03.05記 [3] 曲線 の変曲点を求め、原点における曲率を求めよ。 [解答] とする。3次関数なので、からとなり、変曲点はとなる。原点における曲率は、に公式を…

[1] （物理學）A short iron bar tube having one end sealed weights 2 kilogrammes and contains air of 3 litres and of ordinary temperature and pressure. The tube is made of to sink into sea water at the same temperature. If the specific grav…