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一、(满分20分)小颖看到一卷卫生纸(下右图)上标明了重量,她想验证一下,就来到物理实验室,用天平称后,正好是180克.接下来她又想知道这卷卫生纸的长度和单层卫生纸的厚度,但又不想将卫生纸全都展开.请你利用物理实验室和包装上(下右图)的信息,为小颖设计一种实现想法的方案.解以下的长度及厚度单位皆为mm.(1)求这卷卫生纸的长度.第一步:抽取一定长度的卫生纸(如40节),用天平多次称重,计算平均值,设为a克;第二步:由包装上的信息,每节卫生纸长
One, (out of 20 points) Xiao Ying to see a roll of toilet paper (on the right) marked on the weight, she wanted to verify that, came to the physical laboratory, said the balance, it is exactly 180 grams. Want to know the length of this roll of paper and the thickness of a single layer of toilet paper, but do not want to expand all the toilet paper.Please use the physics lab and packaging (bottom right) information for the design of a plan to achieve ideas. Solution The following length and thickness units are mm. (1) Seeking the length of the roll of toilet paper Step 1: Take a certain length of toilet paper (such as 40), weighing the balance several times to calculate the average, set to a G; second step: by the information on the packaging, each toilet paper length