其实，物理碗的高难度本质是一场“开卷考试” ——只要掌握高频考点、速算技巧和时间分配，平均分选手也能逆袭Top100。2025年竞赛趋势显示，现代物理和实验设计题占比提升，但核心仍是“快准狠”的解题能力。此外，如果你渴望获奖，且没有足够时间和精力对付 ...

The motion of a ball placed in a bowl is an example of simple harmonic motion. When the ball is placed at the centre of the bowl, the net force acting on the ball is zero and thus there is no motion.

(AP Photo/Chris Szagola) Super Bowl Sunday is nearly here, and all eyes are on the highly anticipated rematch between the Philadelphia Eagles and the Kansas City Chiefs. This strategic maneuver has ...