作业帮 > 英语 > 作业

\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05Suppose Mich

来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/10/07 00:11:30

\x05\x05\x05

\x05\x05\x05\x05

\x05\x05\x05\x05\x05
Suppose Michael Phelps,winner of 14 Olympic gold medals,uses mostly arm
motion to pull himself along,exerting an average force of 260 N through a distance of 1.8 m in
each stroke.(See figure below.) Assuming he does 110 strokes per minute,(a) calculate the
work done in each stroke,and (b) calculate the useful power generated by his arm.

\x05\x05\x05\x05

\x05\x05\x05

\x05\x05\x05
\x05\x05
(a) Assuming that each stroke is a perfect half circle,the distance of each stroke is L=½πD=0.5x3.14x1.8=2.83 m.
Therefore,the work done in each stroke is F x L=260N x 2.83m=734.8 J.
(b) In each stroke,the upward and downward force is not useful in pulling him along.
The useful work done in each stroke is F x D=260N x 1.8m=468 J.
Time of each stroke 60/110=0.545 s.
Therefore,the useful power is 468 / 0.545 = 858.0 W.
\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05Suppose Mich \x05\x05\x05\x05\x05 英语翻译\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05 ${limit}\x05 \x05 \x05 \x05 \x05 \x05 \x05\x05 英语翻译大学计算机基础\x05\x05\x05\x05中国传统文化\x05\x05\x05\x05大学生身心健康\x05 \x05\x05\x05function init() { 求英语作文一篇View On Serious Reading\x05\x05 \x05\x05\x05\x05\x05\ 英语翻译Dreikantleisten kunststoff\x05\x05\x05\x05\x05\x05\x05\x 46.\x05\x05\x05\x05\x05\x05\x05\x05\x05中国传统文化中的生态思想中没有（ ）.(2 滋润：\x05养育：\x05培育：\x05狭隘：\x05拘谨：\x05荒谬：\x05荒诞：\x05征伐：\x05征服：\ 英语翻译沙发\x05茶几\x05衣柜\x05钟表电冰箱\x05微波炉\x05马桶\x05淋浴器小板凳\x05餐桌\x05