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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.A group of orphans are stranded in Hope Valley for the holidays, and Abigail (Loughlin) and the other residents band together to make this an unforgettable Christmas. Meanwhile, Elizabeth (Krakow) - who learned in the season 5 finale that she was pregnant with the child of the now-deceased Jack (Daniel Lissing) - is preparing to give birth and teaching her students about the art of selfless giving.该剧根据同名小说改编。讲述了少女林朝夕（张子枫 饰）由于长期仰望父亲林兆生（雷佳音 饰）和初恋裴之（张新成 饰）两位数学天才，从而悄悄掩埋了内心对于数学的热爱，直到经历了双时空之旅，她迸发出了超越想象的力量。在父亲老林的引领以及裴之的帮助下，林朝夕重拾信心，与伙伴们并肩作战，为了追寻真理与爱而拼尽全力。到了那里见机行事，万不可鲁莽。